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 0x4a7c4fb5f8ecc44c1d9a22eb0e8fc6657b68c36f4845812389907cb688bac4c4. 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/d2b9fc60-4fb3-49a1-9926-8684a05ca828.json and https://artists.proofprofile.net/proofs/artist/d2b9fc60-4fb3-49a1-9926-8684a05ca828.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 0x11c183fb4922d95bc7ffb93ef952344a5ab1afe09e6a81e6eb27372e52032a4b. 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/QZFZ32299371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9025f1da96a31f350071eea2d9904389a3a0a9521b4ece718a4df83225c3f9. 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/QZHNA2253359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a62a27ad0168309ec795a49e33892dc96eb4714dda013789d51c76356b49bb0. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZK6F2203713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f9862ad74879b60b070f3094146655286f4f30414bf4e0c8437cccf3fdfb53. 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/QZHN92422064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566596d12a56274f41fab6dfe437a13524c8a81f966b966fd1d1ece72af00ee7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QM3DF2403462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0787a4dfa33dc1e78f56baf87c4dc7105f0bd6f6a61c8d39194f5232123cc96d. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/US3DF2514991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b42a27d02fb5739e000e2db8497a862df53bc5f79a9f57d62ef04c8896d0f2. 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/QZHN82579089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de57f0c5217157c2ebf7bdc0efee7787506eb3832ecebc8578fefce593d8d6d. 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/QZK6P2574643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10896c50fc4a668097fa06d082a4aeb52625ca3bc06e3b4b054008179913556f. 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/QZNWQ2593022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e01fa041b374a8295442f2f8303fa68a274e9161b7e2ba82c955a591323ed8d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE6XY2509770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacd241c34d064e393f2c8bc2584c741b8afbe4229bb2ed0bc69ddc694e88b7e. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZWFW2566307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc156b9492eae36eaf4913b8d4394d84e2f0bfb8919937717cc4534638979591c. 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/USANG2527306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6436a0cb036eb9e6bf5542a300070a180176f0f1ba7ea124ee4aa6e8aa6d93fe. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/DEZC62363455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79eae0caeb7a4cebe7a6879b8da486284724c7673e9e1545d13d2aa9d37f5ec. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZHN62179587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c366042d51baf8d5a897798063328e73a363d8ede9a6e3da34591ec40ce42a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEFN82200301.