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 0x723d69e60e3241a203f3a9c919358ff959355fdff4534533aba76998fe6c1123. 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/a6272a16-ed03-4734-9d55-fcf7f3460faf.json and https://artists.proofprofile.net/proofs/artist/a6272a16-ed03-4734-9d55-fcf7f3460faf.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 0xcfdd6eb045cd6e0a4d916d190b22719e1464964aa2805638710cec9a837b26c3. 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/DGA082498234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1f40eab32df321c679a2eb44e7d1ed07f9ced025eb4f8277ab6e2c89bf6be2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBKQU2459910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7753af8fe0fb93d458c247c933eb25dd3ce54ae081c74ab4615a8e86e1c32e56. 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/CH7812411951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fba27e7ddd8a931e51d38662120576799102fe20c157d8bcaf30a9199788854. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEPI82412233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8182d29a2d67528da576784c374fbea71179ca236c7d693b13a54699f8d7e803. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLDD62400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4b2a0b1a3af7a141d3f2af6ea77aab1dbb70222408eb992a6cf5096916438c. 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/CAQOI2402804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a189f1a9e7120f07779d48fea046ed6177f88dce034b0bf2c9940a03f561c5. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/DEL712410038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716eac3a537f722e09817022c4f4ed67fd23a9b5c9e81f4cda6f4f49df43c3e5. 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/CH7812364520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b75b299613f8f3c53d5f41066beb73808d50b7af52af9bcffefe3d21fe40a14. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEPY32300075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3931aaf5f9948d2824ebf1aad76582641845a2e88abda9f8cd5134831c74e0b6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CH7812349758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe86d54ea1feff8f69742f629600ba76ec782d95419d69dc19b30e6bb713bd10. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEPY32300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0dc2aace8593a268adaf9515d9dc75c3731a6167d6c959e149cc66e47de665. 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/CH7812235681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78f6904996296ea11fc7e680ccb356e8c841ce1fbd66039729f89ecd1a9b357. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEPY32200325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a510bd5ffd5573f23618dae0066ad97c1565cf0765e8f7a11a311ebdf01e8f4. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEPY32200271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36c107bbbe16b4cb01a3241e2f5946ae724b46467a4fbc6e4bcc2ca300e1257. 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/QZS632174752.