thumb|View of the historical center Cento (; Northern Bolognese: ; City Bolognese: ; Centese: ) is a town and comune in the province of Ferrara, Emilia-Romagna, Italy. History The name Cento is a ref
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 0x278f1885c1fd3b59d487f6cb232a7ce02a0bf0aa3dfbef0abf90db3157436e9f. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f79f68eb-83c4-49e6-8fb9-86e48f2f380a.json and https://artists.proofprofile.net/proofs/artist/f79f68eb-83c4-49e6-8fb9-86e48f2f380a.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 0xb5d0b60d6c31fce0c24c4934549e42c14aeb57ec64e71e584e2cbc73075de5ce. 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/QZTBA2228429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318b86b7a1efba0cd68d452ae7f1b6bcc939464a69b662e443cc31f691d56bb0. 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/QZZ7W2476752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2be642ca2631474ae867029d203b72d081e0a525737596b536979f27b33b037. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZZ7W2476753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91d5931f3235e19fedda9ae8bf3021b1c4a82217f6ad84580f1981f01b26983. 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/QZZ7W2476756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06b2a04a0b39a214f3624e3be7fac57f88712f5fdfe47539e5cbfda593bbef4. 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/QZZ7W2476759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb426a83b31ce9c75f19382de58b90f55c7cd312a6cd2adc591eda09ec7e1b1f. 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/QZZ7W2476760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36fcd3359921103daa150ce9e852097ca2d9d6128d3eda7b6c70593921d939e. 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/QZZ7W2476761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2da7597a0b47e45b15e3e70b39a5c43ba721cb7e9a665efcd9ffd2afd7bbf15. 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/QZZ7W2476764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70624580a5095232cb104384abdb1f4d15802844706732d2a97522f9b012e52c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ7W2476762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64afbc5f32c1ae9380ceb917473a18af66c952100044b7e80476c8595fd2e02e. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZZ7W2476768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93c386c39f03e7852cc7e3e00c87944449bb6a517131776c4177f02bb190545. 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/QZZ7W2476765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab385a2aadd7c45dfe35bb9f90f78676a570354b5bf8832ed8bcf184b0514f81. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZZ7W2476770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43fac650cee900de82b24f1f3fda59166c470ebf7af59cc1ffb95e08fe27b08. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZZ7W2476769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ec086777ee601e43d80219e9b14002900c88bd6ed05bf9462723aae4969f68. 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/QZZ7W2476771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7c54e2fff68044f3c5ad36c1790ae387168c51813666261595efbc05c786aa. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZDA82522727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f5d3cb042c18841e767c818b29e0d2f381772af12c9c02e032faecdadffc40. 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/QZK6L2573696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40ebbcb9bda822d69837be323154baff2afa446a844e3f241567cc52207b92f. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZK6L2547366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda965fa4bec78a43576bc0020eaf722e42c35fb5bdc7125b9876d1e51f69145. 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/QZNWQ2572288.