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 0x0d382fba261f10350129ce4a15f892c9a317ba33c13f7321c419387e318ed19b. 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/4841e954-7503-484c-a0b4-e1463c7db293.json and https://artists.proofprofile.net/proofs/artist/4841e954-7503-484c-a0b4-e1463c7db293.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 0x0e89f44664119873955f79d3aaba0e24f68f1a2b3ff330557e3de9f3a5cac218. 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/QMTND2300246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1199d4aff1f51888e1a8cffc5fb1c01d86e53c0f09d1a15d1ea7b535444de1. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US23A1566010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f451572109ff39eb6e3147d847140e615eb1e667a61d3caf898a5f2d9e9df9. 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/US23A1571151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79de2fdb88d12e11e53ba1e16ac3b2a58fefc67c394a4339d9723e63a5e37a91. 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/US23A1558027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6745b01b2185348fb16a1415fd4b8bb79f97ff8aedfccf41789030d074b025e7. 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/TCAER2099763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4201e33e20a63dc25bc5e20d041c77940b64c9b967a6289dc89ad556ed3f86a6. 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/TCAEG1917718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cabb1b15679d0e5d52e3ae61a0da83ebe4770275246cf837a9f0acd0f08e37. 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/TCAEG1917715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9276782cb548593898207015e3bc07cc621c849f362c3993271ed291657c6851. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:50:21Z), 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/TCAEG1917752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51363c14d856a05594cb5b922f8aef378859be074ee8fe14ba8d1c12e5ef11e3. 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/TCADS1876490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870a4849209c27a5b1c767854a6a23b58cb888f40ea0c004f64c617f879a3971. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/TCADJ1779081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca7eeac55ae3169bcf76cf623477f1bbba0b1869ac2c7a3ff05baeaa5cbf79f. 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/GBLFP1542119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bbb68ae691941ef76364b2206b5f58a5373fe549df816b669a34dd7a27054f. 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/US23A1571150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57cc8990a57eac1b0c2d5b15264d7f03f046cb085c5b39b6aeac17fe12fa3997. 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/UKQJK2300012.