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 0xf13d91744acb818aa354f99352b6a16e921b96a51eda53e836b82f31a7cf16d6. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9357fcee-5f9b-433a-a2d5-1fd2b076b9cf.json and https://artists.proofprofile.net/proofs/artist/9357fcee-5f9b-433a-a2d5-1fd2b076b9cf.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 0x4eee26fad091e8bcc669b26ac47b9a337ee8e36eb479fd747af3729649a56152. 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/QZES52052873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5342dcfd593cf12847b95bab6bf9b4360a45e750e5a5281a56cf9d4cfbc610e. 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/QZES52052879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f23db44a6d5d7f5257161074a86a79957d04f4a42dbfcbcebc88ec59672487. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZHNA2599291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13202632af568756cf0be70f0864c36885c017a6d9ffdf2cc88b1c8dbd40616. 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/QZHNA2599293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd946ecf2280d21feb7370e7b3a03947934c0af5e54fc4e2e9ea1069d8783fb42. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHNA2599295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02b0ed73e270ac9d7e4f80e4ec09ae6aea78036717951f56408182f4a9c3c06. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:52:22Z), 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/QZHN82580441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b3b1952f3d85e31a5590d4f7161ca07d9ab9a8c99ff6963db4b04f2ab6464b. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:31:22Z), 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/QZHNA2599300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2867652df4340d95909ff3c8cbe4e709e5a4a68bbe10353b72ad34e22103b6. 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/QZES72079289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d85acb23ba3efe345dc71ed31bc52c3c0cd3fe1820f9162218df962c4e85c2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZW9M2268285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77f3b2a84f101b3f189ce851a3d50681fd8bfc61d80b6f275415b5fa42e02bb. Chain 2 (Bitcoin): anchored in block 957212 (2026-07-08T18:33:44Z), 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/GBMJG2401060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743ec8c8377b843dc302f724aef8c2c573c496424100cb5b8f4ce4bd2caf05f2. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:52:03Z), 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/SE6XW2406295.
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