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 0xa826fc4ae83d75ebfcfd5714ea62a3e5cf640538c024f05e884c46ecbb14fc37. 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/613eabf0-5215-4a02-ade7-223eac7a0f02.json and https://artists.proofprofile.net/proofs/artist/613eabf0-5215-4a02-ade7-223eac7a0f02.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 0xb4e356cc32f762ba5449489617c840e0e3e8a5056bae253d3750807b5abc7a60. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USCGH1393389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4a4c208ce83f4ccd70955ac0454083a52e2a7e9b67d1b797343374a1a2daa5. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USCGH1393390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78469f31f65c134d0d7a3598d5301abede4755a9873b50b68c8ada28175e7fa9. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T01:47:44Z), 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/USCGH1393391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03cd53f7eb09860e60632335167af10cc25461ab07dded2a87550d8cb48113df. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-22T02:00:52Z), 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/USCGH1393392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27d8b0c5d29ae2b8c42a31d37fca33a154965565812b8503e8a72f7e9f88a4f. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/TCABU1452544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47165f62c7c5f8ad5c8eb89f25416bee62a4fd9749b18fb699ae6471edb2ddc8. 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/TCABU1452545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea55043205bd817caa689306eeeb5b913b487cf32f524d01fa341c1190173c8. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCABU1452546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbdeba19de273dcad0ba49d35b739a00dc608b2a88e491633e6cd0b63944b54. 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/TCABU1452548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83361180a0930d5d787a95f6d2aab3e4a9348c5566a708dcf6d82bf29ade1e65. 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/TCABU1452552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033377d0f3a09b240747da733f84a851fa10b65d71fde8c5b2d9d214afb26f01. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCABU1452553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd66ec2af8d1f80ac0ad74c9cb0895af93864b82e5f4127c4bf6f6f42c84de9. 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/QZFYY1933201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba49776a94663526385577cc34e98e2641fa17c28927ee29987df06760dea99. 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/QZFYY1933202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ed66323e0d63704abf3320c484b5dd79ede08665359d909603244df29d0143. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZFYY1933203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fb3d2817e02883f0d50b415e7bed19dd98cff198dca97d031c8809c43f2214. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFYY1933204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b4705f96fd9610b0f148e145b67574eafe25c65ba529df9a26fb3cf514c8af. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZFYY1933205.