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 0x75b802d8f06d7023d9cf4b01c80a5943e087828c6c467ed74b90afd5d0fc59a3. 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/cd6f950d-7406-4403-99e4-d7aeb2e46d19.json and https://artists.proofprofile.net/proofs/artist/cd6f950d-7406-4403-99e4-d7aeb2e46d19.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 0xb9bba70ade1fcc24f787b4dd274025686e119f688fc8d7e4249b7d9b1a486cc1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLB382300269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bba70ade1fcc24f787b4dd274025686e119f688fc8d7e4249b7d9b1a486cc1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLB382300269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2c1f57728859f5edc5dbe2bb968c104ebf45e55427c3f91775c6ba33ee160d. 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/PLC062401326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825321acdc870465ce012e1c3e247337589d98c052324defbf46f420fdf9bff2. 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/PLC062400708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2c1f57728859f5edc5dbe2bb968c104ebf45e55427c3f91775c6ba33ee160d. 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/PLC062401326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbaa64575331ccfbdf95c20ea0944567290c11a709193641feaa6e9a022f048. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/PL2DY2400452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5738bef0f8efc5cff90b8b31adf952aac9722739d97c1c2fee5852af45002b. 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/PLC062393556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1760b0a116fbaa3343cc2e3f18903c90614904bda1fd0130072c4c2c09f57717. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/PLC062393557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ba7d7bfb77964c91560262a4ace91945c423eb39e0866f920f02adbddc0145. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZTB72345701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce800ce6a2e09636982a046de640179b065aac6dc6d0c3410bfc2e471f17f4ef. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/PLC062393558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc56983dd97e3e0ae0dd9289db6223659e957f42adbae71e7483fe488b66ce30. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/PLC062393559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953bd17729a4723d8cb2524627affe963965379e9ec9b2cbb0a20dee29b37da5. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PLC062393560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a538be4bf70d4afbabe803fcad97428faf36a1f44cd77f1ee1b17c64aed92c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PLC062393561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9838bdd3822ac01ddb7985181a544d5ba01360769a28a570da1432e853b25d1. 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/PLC062407394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05efbcf4384adc34dcb9bf285f138455ed59d58fd35c19048ccb33a86f75fc3b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLC062381280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb46717fd17f4b830ebbb9652587cfe8528c8e16898e368901b75ad672fe1ef7. 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/PLC062364487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d330e070417d1d617330e076e9ae4ee5e48f72dca9dab9911920d5a1ef0a242. 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/PLI366103240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c938c0086bb0186e72b23afcf4a3adb63622aaca77997e526c33a3d8666bbc1. 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/PLC062391005.