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 0x1a713eb57dfe78984b749908ac8e42765b2c9325afe062eac7398072a49edbb9. 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/a3f43f59-a397-4066-95b7-4cc069ff07a2.json and https://artists.proofprofile.net/proofs/artist/a3f43f59-a397-4066-95b7-4cc069ff07a2.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 0xbbc1d6ece4f67959803b7f0396f2f4fc78d4687eb1927dae1b1532dce7fc6069. 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/GXD7G2459292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5de72d3afb090a4f58ed5d90f288484046c4ed23f07e5e5241ee520c61d43c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GXD7G2466867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa7da3f1c77531f1fc082d34e5dd5c7452d49e099ac598af8e3215defeecda5. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/GXD7G2470721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78af45841aba71bcc8a46fa9cbe0e2205b4e94e7c12864eb52f114217421715a. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/GXBAV2253425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424ebfc6b37b6e7bebda47a606480644e2d8d7e67c61b86ad46a53d6c45cd79b. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/GXD7V2261097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce14eb9a9fc5d0ce6acce90e74c6302f3485524ef8045ae90efadd3fcbd3015. 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/GXD7V2244601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3724ecf256bc9d95b684eb917055d710fa0a52894acc123d3c248bf3414dc085. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/AEA3A2334794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d51724d153b9139df5d295f4ef8003f311ee89814209e4e31f8d883b605db0a. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/GXD7V2506721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e1c2cf4c77ba347a55607ac788e3a352cbf0af9e61e8f6354e3b36fd2c9a11. 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/GXD7V2530808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b63768b985bfa80c305c67fa04427cf2218a7df41896f14e6ec2c6d9c40797. 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/GXD7V2525809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9949b3a95b2dbf8d3b6b9c19df1bfa08eb0f9334759d4abcffeb957cd36f3650. 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/GXD7V2599820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a4f947fa26dd0fffb9b3a787f28e264e0eae491062aafc834cc3e4884616a8. 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/GXD7V2571589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033b43ded60dc15d0e72ef4081fcb73b6ceb9665dd9116528c26aa138795b10b. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/GXD7V2524861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5009cbb6f1caadd8a65295fc0c34b8b632b1cad47b6314414d8f64107d3c5216. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/GXD7V2555980.