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 0xa3c6611eb9231eaa8739120f793d8f4125252e52dcfb0c8de87a00b1690a42d7. 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/f196a780-2990-4be8-918b-2b60f03338fe.json and https://artists.proofprofile.net/proofs/artist/f196a780-2990-4be8-918b-2b60f03338fe.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 0x0ac9b06ebb42fff55e175a38e209bf1296da3cd23d2f72a6d722cc3b2e727b39. 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/TCAJE2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa4d1e607febcee62a374f297e368ebfd34c8e47d5c5277920fb20229e12f28. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/TCAJE2571648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843576e4fee908ea32cf0c6f1b6f1c7df2f67434814fdd41d3ffae109188da62. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/TCAJA2409801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806a63c6e6ab2be822036f55e1edd168bac3a206be513687f3ee62fd91178062. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAIZ2457756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee0ab78be7415009d3196776b058559bb868deba78e70779a27e0fc53e3f136. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAIZ2457872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f6d1d6632cd97afaed15a97e1ca1aae2b282d40f1b20a6ef526db7cc5ee089. 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/TCAIZ2457878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844026c5fda44c4318c35c95686bcfd33ffdef0e6e625e149e3142b60fbb4b2e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAJN2559633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4cfc894218ed28d62fa8bb394024779eb8d290c62c4e63b41ff7544b72b6327. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAJN2559639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e9aec590a8c7f3d62067bf955bb31c46719f753e275c6ed5a1f978121ef9db. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAJN2559649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4de6dde0c96bd9a90747e1623254564591b69d7824f7166b0ad89b0024baa8. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/TCAJO2559656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5149b3da8106cc08f0cfae14f4d043075fbba4331a5b6e5f0390a111bde6da. 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/TCAJY2560540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e6f05adfddddf38bb6824270f98802a8466c7ccec345ea5e64e098730ac8b6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAJY2560546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a683cee0e45f47570a4e04fdab979ff125e87cd3856c9e8dd0d4ec1927a902. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCAJY2560549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cba84b4a7248b0953638154854db10a9ee44bec5ccfea29d05655797ab2c80f. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/TCAJY2560557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31344b44b12ab4870ac5c00c4e7a7aa20e08be155789bf40f458fd3db0a0e86. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QT65X2582511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0569113af4ad3cf617c6f58ee08ac6c62943c9da0c2cff91d8d5a9832876d6. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QT65X2582528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03dfe9229f1dee611004c91225c8d7b3cd534c8f5ae34f163fc9dde7c002c9f. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QT65X2582582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e5175bc89c339178c156a4691e9bdf204eec6657eedb335648893915836869. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QT65X2582593.