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 0xe575b5e5f95572c4b5d361accbf59487bad5554a809c0647f9b5dab2cf63c09a. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9755f76f-e5bf-4ba2-9c3c-ca837e2b2770.json and https://artists.proofprofile.net/proofs/artist/9755f76f-e5bf-4ba2-9c3c-ca837e2b2770.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 0x6b1082b0736779e5c310860032b8f75363ba57ee227901d21496338668f92605. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USHM22153762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdefad05191a4c691ce168060bc123431a4fc42df9d490d770cbc4a0d64e67de. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZN882228273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448ab211ae58bc851d8d1c7428a75e8a14efd058ccf350ff6bdea8d5f73297ed. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZN882228286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a84d04bd2b05082f3bd70af11c8bdb179bc575de111790631ac4d26c85fd057. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZN882228288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff43c7272bd91d5870e8b7da126f8dee9f122ea1db4a7d8220d3e3b239fd5365. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZN882228289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f026cae03d80a8a4907b754f10a25706dffbd16ca0883318f5211a89cedf84. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZN882228290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761b0b9afdef1165cd9e2d3e02112b0f66148b100b4f7d7a2502ca78950fb545. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZN882228812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8134d6ec03d62605e5e279198852623bc9c6432fbe0d4a08e264c534890b79f. 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/QZN882228824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32dcdd6048ffb2c4f79af29bb866b647e37b7db9b6a674864a9466e39a7b2a1a. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZWDW2207300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4f081d3867cf6e901d97cfd09c753e2265ef8438c0ab94e7ef6a499f96a04c. 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/QZWDW2207303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42f9641e088dcfd6e0bbb5efea61638987722c065fe1c9e053ec66c28553924. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZWDW2363412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9f8e1cd5baf807d655603dc7f6254affa0bdf58615f8a82b3761d887d070d2. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWDW2363413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6826b5d4e6561dddd4c6684acdf8fc33d84a696db4978d52c2a5578fb89c0562. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZWDW2363414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e3beb490defc8698d5bbd839f260a6dad3ef0974679ae24d28fcca325f8789. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZWDW2363415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9a80d5e907bcaee33f94df3f65ff6cb3357961645c11c3e1224edfdb31b1ef. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZYFZ2385977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632c7f605cee4f2187b57cc5d152a6b10f8f9c7ac63ead37f36a6ac0cabd9332. 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/COSO12400206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8b69c14f7e3598346b9bf066d380b6be550bd5da30e36118bb55679b0e551c. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZN882563430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541fa6b65f68c4c65b6e9b40f669872fa4e01622d971d551c355d2c306443336. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/AUMEV2521799.