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 0x6e644f47fe1ca7f5712860ecbc6079662053b7cfbb979d849e9f7483a0e8c45c. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b23aee19-33e5-4ffb-a345-dce55a83f5cd.json and https://artists.proofprofile.net/proofs/artist/b23aee19-33e5-4ffb-a345-dce55a83f5cd.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 0x8d2dd693850a3131f1c660a05bff307a8223b6fd157ddb1188c1567bc62908ca. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DGA052450978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74154a6ffdf9f2e0b01488190a948a05da7c34afdc1086d06207691676fc5d1b. 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/DEH742418101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c5aa596a90400b69cf642f3b1558986a5a389b3dbd89cc11383de9af937f86. 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/FR2X42404632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2dd693850a3131f1c660a05bff307a8223b6fd157ddb1188c1567bc62908ca. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DGA052450978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c910596a543f65717015bda95c80c1af1af5899dfa5b592a4ba99e1e5822f7c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTH92340420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9569d7f7b2f5e481f461daef73babeef255b418933bdcb63493bdece281b8f9a. 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/BEN582400473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cabe5f6fe5d3a7e4e46fb798529e76632b888e760200047d2dda4fbea9b0b94. 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/CH6542375354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5317903413ccf699d5c8b0bf9637ecf32cc9a34863299ecf476346e286475c4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CH6542375355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ded7fe1b6dd5d025bc9d4313febf439cb8e409bbe41e75e97dd8c7e455b8a47. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CH6542375356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361bbed311e2e784b622e4bd8610e0a43b2a68027c5696b3881719bd87f0ffc7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CH6542375358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fd2b69f5b7f80f920568c6046c73bc983b2f4b4390822bc7b21f497c755e6c. 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/CH6542375359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88096030353f872a247194c17a148778ada4f8870d70e1fee756d0b66b9e565. 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/DEH742420826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9de664d1c6dd17b9749e534d3fe3f9d43960b49d86f4a57657631400c93545b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEH742420827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed5221e493835e0b609ba459ab0cd37c17cdaa40888c80ccd37eb58628ccca4. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/DEH742420828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac3abad9c3ad4d47f9375d1255ad4cea720ddd61d3aa54d9c35dc62472b37ab. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEH742420829.