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 0x09c1ba70c3ba49c15053b849e21fb9e30213d4f3c27f213b20c703da5e0ef165. 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/f18410e8-fe73-4536-93d1-0808e549e66e.json and https://artists.proofprofile.net/proofs/artist/f18410e8-fe73-4536-93d1-0808e549e66e.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 0xca2d980c24e3989d7c65f7e0b26a40d9a2eedd1fcd7d03729a162f34dd735b1c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHZ31974583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c28ba44f849f0e8822b28574dbbfeb8a62a100ab0b99308d6afa10fa1ebb5d. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/QZHZ31974585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30821f0c3dfb1c3a9fef21e4f12864f055bc4323f7f5e92f623af024aa356e83. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/QZHZ31974586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e727e8466e9b9c1be401f4b1e03555d9ae6e4cfe4dee46898982b33b3773dd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHZ31974587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b5ec6191eae41b22afa12732262beae12d9227e847038d54c01caff5667661. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHZ31974588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0c66ed7dca656f372d1dcfe6721d9fa00ae5130c87d8901db1ea911bacdbd8. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZHZ31974589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7deb86a2f3cde2ae928b447589939c3da36fd3ac6e0c2fbd0b35419318007f30. 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/QZHZ31974590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcbbd952807993d2517349b19dd4e4f8ffbc0dc11e5a6b0baf37fdc882ceb00. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHZ31974593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169d3425628cddd8abc57eb63201247e955d8e7e17fbd268e9a34c9c5503dae9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHZ31974594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9069523b3a6e8063e9c82cc1667ba99d2ed755995305c1840e1c4c2506aabf1. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZHZ31974595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525cd7caf10c31b05f7b657aea377762f824ff729ccc71a0e5872c29681f5113. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/BXJLO2000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c3205293d4ede70db19df073c0819a878470c2aeb338e8eaaa57cbf1ccc475. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTPX2160549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc534ef52282eb1a38e890b5f3f9f3a51d94b1212270043744207afe6ee27d88e. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZTPX2195503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db5d04dd99b7d4d873236fe3136886e4c9ab0e27610b4a2fdaf035049481b33. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTPX2195508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe648fddde3807ed541e7c3995c8d542705b2c7d9744e4019d5fefbd98812dc81. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:41:27Z), 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/QZTPX2195509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc8b1fb988199826fbc413c99988730811da3e11938871592c8e6aa20ef11d9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTPX2195513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00c98044f0316ba7a43454d791bb2c03b3241cc59eab9e247e8151559a45ce6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTPX2195514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710ad456290ad5e844f50fed024c38cdcf4221c1aa40cbbf744f98fa74eda9c3. 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/BKTTS2300171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8dc495ed92185793a462669c802eef31515205b35c2f6e1833286ae0f22980. 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/BKEME2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cea92bfb14de2fbe05f2b09ecb79e62c2fb698300a786a8c1d522e5f7125c2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNJX2445365.