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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f2717ccf79017fc3699ac3768afabb7f526bc1c367df1461ebb8ecf8030def. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf949abe-c833-4f05-b599-5bc653637086.json and https://artists.proofprofile.net/proofs/artist/cf949abe-c833-4f05-b599-5bc653637086.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c361ddde5d565400c1128f53d48f331136100b7c2564ca866beeac5eb2085c4. 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/QZWFH2391722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6cd43f54741a0763bc101dda6b7ddaf4eefc0675d40f8f651ef28d81bf27a64. 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/QZTBF2385621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d39fdf3b2daa7d0fbec46227c3927bbe24057514be0cba11742eff847342e92. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZWFH2391724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d157651aea77441bc41fa9595ad6054454f1ac36a4af34170ed682726e7dee2. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZWFH2391723.
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 0x7db6b21b135a2bf2d440dcb52bfad832337da86e5ac3bf02df714180ac098d39. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZWFH2391725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0de9b0ce64a94c7fb7e06550e8ed3de318dcbd8f02d2dbebf89df5be23b861a. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZWFH2391726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc977a04cd4963acf26e8819b9876ffbc9036d5ffc0168d1d240e26fd5b882327. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWFH2391727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e9b461919b6e15f4f5bfbad4509c1b7559f11036c5907eee68d3e33bbf3f7b. 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/QZHN82255387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa0b4d0a0190728b974f0c4cdbdcf096adf6243dce46a6beb4973bcd29464d9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:53:32Z), 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/QZHN82255390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06ee9b4d5ff36a87df6c4af2209c551e850841630acf2ec036fa4ac13f3a09a. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZHN82255391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2b81de0947d4776b58080a67fde97309bb325a3c4c14dc022260274cab6a7e. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/QZHN82255388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ee85cfdda05eedda5e050f2a7b5a02e46ddea0169cdb7c0842568f9316c269. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZHN82255389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7877dde090c7dabc2d78c59c30e9c42e23a383e148d043101d75adcfa604f2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZES72182746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1eca7fd53e900b48c233f2ede9f09170ce5b70fcb7d4ef111adea02496579d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZFZ52151039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f9d84b20a6fd2612d48fe9379edb1f8d6624b1d861e2062684d94e2f9be059. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLS6R1887306.