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 0x0d056e48998e1c58b5cd04939261e51eead7656174687465da4214211a0f8928. 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/a97a07e6-7ec9-4aff-95ac-64f5e0ef3026.json and https://artists.proofprofile.net/proofs/artist/a97a07e6-7ec9-4aff-95ac-64f5e0ef3026.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 0x88de895590e72a2b639bd7a325a1675932fbb5a6319489587819b76c45f82537. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USHM90523862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a95e9226a71d9e25d6e9e8b2c7f8ca692b2098ac3d5ba674f39d9f11e57414. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:19:50Z), 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/USHM90523863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4ecec956ccb0e3cea65d0ff9876ad904886615f0b95787a5c4a1102ea936ea. 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/USHM90523866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfeefb87702b332e994a50fd7b30dfe8e1a39185cb1bdab60de3f736b0eed23. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/USHM80429574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d7af076a9f146d0fc402d523ac772b79c5208445a507e4fbb9c75758974938. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/USHM80429582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca789213b2603da6985902b13420ac74aec94b2acb0a82be6bbfb9c6a78aed7a. 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/USHM91067083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d166def62583aa9beefc89391858f4e5975205be026c34e072995db5b5fad75. 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/USHM91067087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848b6cce3c9e35443e37993ee8c6bb87f0255f7155dad53d78b8bba9bd60935e. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USHM91067090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab9bf7570181b92dc7968dcc61dbeda9eed627d90f0f93bad9d1911a7022b45. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USHM91067094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93c6c1d2b9408731302fbe770444d2a64bf350ec024be49d841048f18130ca8. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:20:59Z), 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/QMZPT0711220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fb1e2f1a80f9eb5a42de19a38644477bed607005c276c3071f7cf1f682f382. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QMZPT0711224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3762ed7e3009cd7e72e1ab7412ec09b0cd9d838e7759e66e4fdab787beb05b7. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/USL4Q1822158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d7780bb58bf27da4bb7501ead0932a12c3df44fdaa5e84963bb71ff62f587d. 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/USCGH0917239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d4b524aa0689672fec2bf5d8308f65e9e3dc24d209fbdd38767ee1e14595df. 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/USCGH0917243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb70b6f5c4e7b683a72f9ecb4da443e5adaed995169362790eaf52d34973d63. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USHM80429541.