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 0x1a32bda9a2ddbbb223b0632a42f1125c05b466988139d801b2cdd647b5bcc0b1. 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/837cac1b-4696-4a24-af62-c8681b70d3e0.json and https://artists.proofprofile.net/proofs/artist/837cac1b-4696-4a24-af62-c8681b70d3e0.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 0xc1ce8825bf3b7df858e6256555b829e58c1662ae41e88badc6f03cec221f9586. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CAENV2176626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8cc1845bb718ae1aa6e789f38e0e98dd9e4cbf65d36e5283b16359808028bc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GB2LD1900522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0b15c7feb0cf708c1c07dbf90ab16f3875b601e4ac46796b96cd068b7f5173. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM24S1910617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6fee48f9152381f0b7c3a3fca2d4b784dd3982d3e9599da6d690853c6136a1. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GB2LD1800884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d389d3d9c51c983c2f1e4b70b5a4391b3e05a03e23b50d5c7b86071ab0a009. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:19:06Z), 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/GBSMU5775185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa42796908fe56329b93ca0b31df91e41eedcdd7fc836b3ee731b1f4f2ff641. 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/CAR071700018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd73867cad9e20b26b8c80809c328f3b2a6273ef93c354dbf8458367bab97c48. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GB2LD1700363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9426a04f238497add259a41a11c8e01e9886ab95d4d45d027360af756d1ada4b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GB2LD1700201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36df1d5da1b9dc9f7376223f902e2f12349a9a236e960e032c2ee4f76ca7c2d6. 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/GB2LD1700114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e52464883149db6fa1969ff3c431ddd1c14f3cd81a00f5930bd6c885e86dc18. 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/GBSMU3288899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce70cfd8eb369282726f23e059c112be24ae997bd998ef92c52b7e21ae13db47. 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/GB2LD0902547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70a0ef714ffb5f85e8e526150da85aa27aed71c0fdc061dfd90843889498459. 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/GB2LD0902535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26463787a31303a3416cd6f8ce25408152f48f20dd941c174c6168ee75e8e76. 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/GB2LD0902502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0c62bc1241aef573db62cc02b42cc90514338c277a930063660d307aa2a24b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GB2LD0902400.