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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8ab3e0b7cc36ef17d7cf7dc9cd612cef9ccb20871e8ea254f23fa96bfcf4d3. 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/becf550d-0b74-4a9a-a01f-b7fb85c1c148.json and https://artists.proofprofile.net/proofs/artist/becf550d-0b74-4a9a-a01f-b7fb85c1c148.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f0f9c27b766014b94514f8c459e0bbe7ee4d05a12d5d194e4824b27cd04fdd. 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/UK6821858849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b62288503c9b0291b578f71a09e4f345a3c5434fda6bd8ced454509811e81f. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/UK6821858852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc025a9d082e777e896d3a25aa52b07be6df194849edcdc3f17594d3c00fc64. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/UK6821858865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f17ee8539ef0841ed2f6e7d85dec83160be08831ca2481b6a579b909b3c21b2. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/UK6821858869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4135f44c8e1ed6853dc61c2799990486150aab2e14abb02156825dc3df4bd3. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/UK6821858870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8852d78685a93f6b9cbf640a063eb43411019526992de7e65af772d491b2fb. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/UK6821859919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a7bfff897f412224a3d8527b58fb36eaab06b89a7c7f3056bdb356859d3284. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UK6821859929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b638a06e29e08ce3d63efecc6459f4c449b091aedc3e30140a0d595e0a7338. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/UK6821859935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50a3b9b9dcd8dcbab37b6d9ad2fdd854ef326a99e35a550859f30c14652b4e7. 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/UK6821859952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4eeff6b5c9dfa9841b8f50c407cac28225c9cc2d23a53ad81f3840068ddd2c2. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/UK6821860080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ceb6c5ff703def1fbd907d2c6fb1c008b26bc5b6ffcd04282abc3048591d73f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/UK6821860089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a51551a5dcc556de8540b33f22be85498a19658eaff66ebbfeab3c43b086b5. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/UK6821860747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8683dbb21cec18318d163bfce4ab1682294bfc01c05a412b5053850b5e0a9132. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/UK6821860758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef05ba1cf587fc17548e1ef7ae67eb2789a3cafd889d16625abb41a4d9cf207. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/UK6821860763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27db78e0c58adc94f7c71594cf3a7a52b310aa0a3a5fa7cee215e4e793c60224. 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/UK6821860782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fef9ed3fa17a6d6db362ceda6c40aac468dcac5524a34decef9c0045e96379. 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/UK6821861519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2edaebc3cf004139b120c5844fb3ea97c9d8674ef05fffb18243e4a1009e33. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/UK6821861524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec4ca9c5b2882804bae7fb7906d5eb605a968d3173e48125dc14c08fbc25fe8. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/UK6821865217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3046ba1685dfb73e55093fe8d2cba3dfe96c3d3bf4f4c47217d931c1a7ff1d56. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/UK6821893008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8635c449dedb5e0cfe349a2e75b9a8016582ee9699707b0b8185d5454f56481. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/UK6821895428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd199a987a38d9cd7be2d41a9e764943fc17fb30a0db4fa32f08747edaee5c0ca. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/UK6821896537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e3b8ec352732b6f3ce5b82dc5ea81182b9043c7b59e6c56e47f9611ac29ef1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UK6821898607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c939c2fde039bfebb4f4a4a39c3f3411a15cb32b42f70e0602a43596e0fb8a. 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/UK6821860020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61cd330871cc005b8bffe9fa0dea72f434dc63fe00fc810a3d0e4fba94b9cc4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UK6821895420.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7e4fff4b64d4641276c99251d5d00ca3338bd4434fa33524788c846253a851. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/UK6821859942.