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 0x976240866e51ad088c4354f1baa349f7b92fab5f2bd7d8e265857e9c92ee73a3. 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/9b77241c-637a-479b-ab86-d290da6c86fe.json and https://artists.proofprofile.net/proofs/artist/9b77241c-637a-479b-ab86-d290da6c86fe.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 0x71eccfbc67f89279b8311810169699cdedcdaadd1abca8f5b717a8b8cb4c9bc9. 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/TWA472218004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeddd5ad332e7d76bcd6202a9245bdfbec4bc3c27b2f31dcd1c6b2cf7392a116. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/TWCC32213620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2bc4310860db7fa37188de97303c4f8fefbc1752dcf9d9e4f6d1e7eae35a56. 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/TWCC32213636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e5682d86534ec76cc7855ef1ef044e22495af8241a9966f7455b3e6077c24f. 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/TWCC32213638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37a1f40cdadbe9bf6b1cb9d7f766ae6061446566cbda2d41b4c14ebc045a520. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TWCC32213639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57739c6d51c1c3bf56716274b31f4c450e40c1e440ab504e95d5db9bf78edce1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TWCC32213642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7b43d5827b181a0848f302d1ba9df6f060f806405a3f9fd25ece96113fcef6. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TWA472475002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f57d87a00aaec41eb5529ae97c9a1c6a35038e50e4f1aaf4be2bc062786527a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TWA472475001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7b43d5827b181a0848f302d1ba9df6f060f806405a3f9fd25ece96113fcef6. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TWA472475002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfeec9257322258398357f3c57df891f4a355118ff2f5793044700b5d5dabca3. 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/TWA472475004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382fd054c0ee907b933853a8cef37d1c3fb867b85c1ad826cfc505a38b4bd04c. 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/TWA472475005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b1674815099a74fbf2c0113247bcb67497055648e3da6c6ce168192832d72f. 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/TWA472475006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472bec5d420d7280adbd737807440e3f918ec09208f80bf2d487b52cd9fe20c2. 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/TWA472475008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe0517f9df5043c298923330f2725a75874092ef7fd464e1cc25857a5cf3344. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWCC32209037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8009632170c01481c8c23fc67b5272ffa698071fbfb91dc66db2308238fa21. 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/TWCC32008132.