thumb|Scaccia with tomato and scaccia with ricotta cheese and onion thumb|Scacciata Scaccia (: scacce), scacciata or schiacciata is a Sicilian stuffed flatbread. Scaccia is made with a very thin recta
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 0x2582791fec41ff5cffa7dacc76f8157fffddda082c3943a14599d85b05df4965. 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/1d4f4094-306d-430d-a0b9-b34b61ba87e9.json and https://artists.proofprofile.net/proofs/artist/1d4f4094-306d-430d-a0b9-b34b61ba87e9.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 0x8be3a060450b80e342b6bd04853dcfab9903968ed7697b1974fdfa5f79464603. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZGWX2079817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdfb23fb54f48352ad62085322fce7536044789379dbe8d9664062c26d5f7e19. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZGWX2136666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348fe104ce43c00ec75ab5931f2665f8026c343528625ab1fde10fff9d62531e. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZGWX2212414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea47f7ac32322abfeecebf2703f1b24be7f03328b832c7f7eb39223b9c96f258. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNWW2216374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab36c23b60c97b3c2618282f77889b12d36170c7937ccd89b07ee118935c298. 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/QZTB32261180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8611a4d465f9cae49a4e06677f8be1656ff4a37f3bc93d3180bced9752b56f76. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTB82247931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b182468da79f501ddfeb8e56a045a5a6905ada9be46854b966b90e91de86604. 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/ITYKP2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af271e5c393d1c64684b2a6965acdabbed2c52c3804efe6ab074632d4f9b842. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ITYKP2300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbcf98605e269435c2f4aca13e973b792be5fe546efeeed687f7b05d270ed15. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITYKP2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49dc0a9615ec67d6cb5811952382b39c98e6117eb120f20c9892f5458abfd478. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/ITYKP2500054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87be937699156d4719400db291e03d826131f628bca90fb896c2c7155d4847c4. 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/ITGGO2400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b2f55273070cdf71fc97d31e9b9dc60008ae85e67d8c7fe28c9525294273cb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/IT1O72501293.