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 0x2fc36a3503e3b27eb682cd670ae4cab5817c0649f27fa1f64a4f4250dda2d21a. 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/e8c547c1-75fe-467b-840a-e173b85a5c03.json and https://artists.proofprofile.net/proofs/artist/e8c547c1-75fe-467b-840a-e173b85a5c03.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 0x1354d8a9c9c0cdfd2831218ebb462be41330ada28e8e027592bf96abc3538127. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/TCACM1669454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f28c40abc5014cfc5bc0e504b429021fc2044eea9f40c96219e3d81cb01d8f. 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/TCADP1889499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4a22c98c2ad93529044ee8d54ee5a85cdc8940a3c65b2d99f31a09c655b238. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAER2000231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa38f022b6ca70d53a3835a86bacf9c0dca3442a2b029786fbbf6da3f20ebe63. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAER2000237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f3a57014836ec7423596df7177dfe757b35f9c7e752258d266e9bf05e69190. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAER2000297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3f1fc33e38135a221c5eb56474a96738f21c1c9ade8bca76ef8b1b40c4cbfd. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/TCAFG2011147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e1e76aed5b6bb1c2abf6362c605c3ec082085cbf888303ec65b56fb06eb29b. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAGA2290813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958d4eccfaf3fb6f8f5f5085720e483b18fb99b6c6d0b3a86758b0975c94a957. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCAHG2364438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56002ab18ec9d235e48f13bffeb0a139c189a2af6679b5ff82ed77e25a6dad60. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/TCAHG2366001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc35bcf7bb6ed43189c53973ce8cdc140e2ca5bb0eb4c8a59244aa28a9b68fe7. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/TCAJA2442919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56acd4899e3285ad61e7ae2c92384a4ffec748c26bf7dfedd338660e31ea420f. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAJA2442931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb380daa29f5286cc3c928f332decc7a2b86f2ce92f5c8ed0aaead5c545d60a98. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCAJB2443009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb7962c7562bb81e952ec9a0f7e725dfef5758bf792d218583e3a8b84aa0e55. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCAJT2506068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046e1a4c173e2a35f775ff21b47ee61e00781f1f6bfc39d4366c12d0ac02885d. 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/TCAJS2506406.