1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d1246555d1cdb4a6bacf7192c2fde855e47ea41d1b0d9dc84ec7840aa1cb37. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0201bcd7-eca2-4b4d-88fa-fe9c0901999c.json and https://artists.proofprofile.net/proofs/artist/0201bcd7-eca2-4b4d-88fa-fe9c0901999c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b50778e7ea71d523d0984c83224907e089b4a373fe401917cde7f30790cb92. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T22:12:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0760600030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a94907b852014411cfdc031a2cf03ca9c8cc583e0d0e1372908d02bff34ffa. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T23:59:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0760600032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda97d33b55e489845f10b41b9325344be0499ff49ad09f66ece9ec143bae29c2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0760600031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ceadaf33844f9d1cb5f698b79ca7ed08077c5053441238fb1777c0244724dd2. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0760600034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60960f3d576328b712d4ea05c83b7d1a40f4fe12d8f8cbdf2d049be71e84678e. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0760602545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4286aef50d396be49adfe40ed6501d37541d8a6b277c2c41007dc3195badc9da. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0500600134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364033ceed7e19568d26f4acfed9dacee0cb58e6a9cd939d33712f1a2ae2c8b6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0500600146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9cf3d99e714c73b51377bbb53f424a9f2307e12e891b4581684d34462a8ed4. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0340800057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d779e2736e29703c0c529a3686f489ea6e240825256c9e9b3eedeeebd88cbd8. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0340800063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c96bd0d764285e26dd6537709051aff4ffd2d4aafe721c0b2d91d3c1ec26012. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0340800070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0cd21ab19cc3e433e3243d1310dc3e6599a26a8e2d472f7b16dcaea0e18855. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR6721000054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17fff24823c599cc0d4c645f8cd32a877c544fb523d95bece3008cdbc0bedf2b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR6721000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9881d21769a74aaa3a612d99ee9a25e68f61ca7be9b2702c6e1294f8fcc99f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR3911200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233d3cc164e04e59ceb159753a5d7b480b97a21297038326fd92519b19e64efa. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR3911200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb312ba51896b9c567425baa28837a8b9eae0dad02cd9b69079c7c24f323c5727. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR3911200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0aa589975bcc4f9f9f7ac3b1806e479eb37504125ca894f569d8f861d7f6758. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR6721500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acf30f3fd7e9966852810a3134cccdcd9be4c4ee80aa6fef965a9ca966c8162. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR6721500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483731d115e8a6ed82ba163d55225694c6892757eb2e59c55b61ba9298024052. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR6721500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f353d21a683621aecc5c475b5b048d31bfa3c7f313a75e423c77498b644a11e. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T06:56:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR6721500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88df4355a4a7089b1202e84763286e6de05d45b445a4fdf9e25582fff384e94. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR6721500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87e1e203b55ffd9de9e3b0ee29da61ca673062f1fb86a7145a4aa0c69f811f7. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895da46af04e10e13d4f380b365ac0d7db86f4e88803e08e0d099a68031d24f3. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577baf4634ec3ff9478c95f2c4d3ba5d213580bb6af5f609ae19e44e39b3326c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe388170876e28fe8f9991c5803e6dcb38d04cf63dd7909b1538d50f33ddac9. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bf1be2e89dab4d43685aa0e540d7ba54dd072ae03506d8a7ed489f8553d3b2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87e1e203b55ffd9de9e3b0ee29da61ca673062f1fb86a7145a4aa0c69f811f7. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:01:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743baaadf18fd700c0e73d49ff639cfaa6dda83e7cb7fe49c23f9ae76aaa3fc5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR6721500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577baf4634ec3ff9478c95f2c4d3ba5d213580bb6af5f609ae19e44e39b3326c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42b4644226bad96a711b45428c23761fb1f4b6390941e764bbf1702899a990e. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d4e0703b9f4e8b97835700c9184da79fefff77c338a5762075bd0bb6b54e8d. Chain 2 (Bitcoin): anchored in block 958654 (2026-07-19T03:55:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2000015.
Yalnız Değilsin (Eşkiya Dünyaya Hükümdar Olmaz Dizi Müziği)
Açma Zülüflerin (Gönül Dağı Dizi Müziği)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fca68c5fade53bf784609f27593f2a667891042a69f6c36f79fb286677cb95a. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:47:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b29cc3382bf56cf7d1909b46436095300188b9bf43b97f8f5844f386be33e9f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc050d2710823fdc4299fe8c7f3be188c6c35b04e731479f3853eb14e243a0a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3dba35b6922bb3bb95f7e193ca363b059687525ae2e7eca0aaeeafd53151f2. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb78d39510439ed7cd7109551285f496f499928fead777cc4d4e69452357339. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa896588d11760f3466027792427b200a9a855a7f8220bbf2cd55a39f209a0520. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb555da6cf3e74250cd954bf1f39c85cb9f079a99b56245ab379775cf11c8147. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7347bf238c50ccf0b660a5b692bbc535e894aa30d0b3c97e62d9d2c9ee676cf9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109cbb15a63446c6b28f24aa07da5d38b52723a97d5a4ec57b417d826e396f4f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2100064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0a1a001be054da47644d6936ef7c1a2f0b8c8540993504251486e1e9ed9b4d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBMN2200500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ed8434ff01d61058f1d70314f8a471133e715bce872985a701bdd9254ec18e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TRBAH2100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710c85fa1983991a896b0ef7f12331367151a01ef92700ace5c4d67d3ab3961a. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TR0411500151.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch