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 0xc1819bb66e8bf7aa5ac57d2fe28ebdfcbf9032f4c146c5334bd228d1be1f394d. 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/d061d715-49d6-4e3e-b22c-c7261a06c781.json and https://artists.proofprofile.net/proofs/artist/d061d715-49d6-4e3e-b22c-c7261a06c781.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 0x66f9c45bca88793ea82b8c9e2078eda32a0716dc93af9701a2fca95270f27fb1. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ESA092403935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47b5feaf223e4ec57d5e78a27e8bb7784919353b3961c0a78eedf8279ba3400. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/ESA092403936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ca7a9871e0f21d77fc74784039793472874e5f149c67b50cf63d6a3f1bde98. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/ESA092403183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34850c75ab452922bff85c34cb933b3bc16887e01ec91916823fe987c1df9891. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/ESA092403939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f23ded8f7da5c8ea9f9a8862e94a7351bd010fcb39695c186277d3052457bd8. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/ESA092403940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86f9604c27fecc7699c6d47fa2937260f6d3ba00ff898eadefd39b43f1d1bb2. 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/ESA092403941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b97e585e281a272c6ee843809b7ac45bcd37aba6cbd1ec819644a20340cea4. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/ESA092403942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55d932359f96c773c51d1b5b4e95dce4eb65050c32a2860b0a6313e65db7be2. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/ESA092403943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de493c3497532220dbc1130c8e064db6841a5b10365316e9a5506fd5acc0c0b. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/ESA092403944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39927ff02295d463f45edfd26065b8abee53c009a1fafa00c991dc9af8d5c3d5. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/ESA092403947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a5e893dc23556c7870ff9a2aacaaf314b3c31704c2ad119edfe017f0478a20. 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/ESA092403948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fbadaa9a603963f0379ec326b900db440b639bdffc1906ddad5324a9804269. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/ESA092403949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f02c04d190107180b56c0ecfbf686a2ffee00c2975959c8e5823fa0237c9cc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ESA092502789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab9ebbe49221b5cf10cf9ad6360909f022bde03d9704af7f0b5f69c4670a56c. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ESA092509945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9ec9a62bbd3cca7318e4ba01ce3c0ba2bc1900dcb874cef31c29347616db54. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ESA092509946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e00a274da2df37fe28955940b1499b648056366973fb2b2b91e1dc9e319539. 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/ESA092509947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f46b68272a68045130938a0dd76352dc0bee2c0cc55160180969b6a4a00c180. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/ESA092509948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99a20eb12946ce658f8611ab388dd75db7759e77ee589e4fa5bb4de0fbf936a. 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/ESA092509949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa08ce5037e1108fefef28469abfed3fc586076ca1d2a3622a98ad7615e51bb. 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/ESA092509950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8241d9a037dfd706ed806871d2930a24decb08ba0a375ca27e489eda5b5b202. 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/FRX452547571.