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 0xf730d3c33434d4ba53c994e82e803ddf2daab95625fe67952fb1431965ced5bd. 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/8a1e98a0-3666-4bf0-afd9-9e12b79f43d1.json and https://artists.proofprofile.net/proofs/artist/8a1e98a0-3666-4bf0-afd9-9e12b79f43d1.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 0x3fb063d14c2eae9dc20d5a8c90c1e1a5e15fe29ea04dabd0200dc1490dc9521f. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/SE5BU2092136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1da583359e748028dd1b5199c25d54d69c842ea4f5fab69ae87d765fc536735. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/SE6A92080132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b3eea68b302d2febf1778ddf811683b57b9012d3681a486111373b950b92cb. 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/SE6I32009690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ee6c9dfdd210abb8f1da11e69c951a8d0bc12140c2642de9ce6fa70bb3684f. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/SE6QE2058228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4d66350d94efebeda6586a4432d3afc1dd9876b6339055c3bb62db04390339. 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/USHM21476238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abbc427846f9e738aa6435182f86b2e5f680dbac601968c24b65f97f440bf42. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SE6SA2027986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0185c0e85423b48c048c77a1fc9ceed98c5c2e69f8ec52b60e348f5d1ba8a68. 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/SE5752115860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa03cda5f350fd6a1b8b7c4a7e18448b8fed6a2bcfbc79fbaa8bf9acf664154. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/USDY42103814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508fe9e54cc0238f1a1b4a70f82239f329567611a670b52a08f850b1c58fe9cb. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/SE6QE2125832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52651429c66505f5a83d9fbd35663609fb8d1d24042e0b25d1f9077ee600b4b. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/SE6XX2195709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e74fd4fd497a2a56d9182f4e9cfc63e24043f64fee39feca773fe6d1ad88651. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/SE6XW2172796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebf00bb8cd90c6839a859e18351c7df0ff5c85351387fa24a4b8c855345c4d3. 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/SE62M2178654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd314f282d2c70cb2b7791057734915ff38fe87a3385e5c4bc72830d49073c21e. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/SE5BU2293196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9816af417e74776433aa115e85baef512397fa104187dd2ad9be0a7383a02ff3. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/SE66N2294201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55fdc210408b72da7d5df7bbae07468d92545d7efe46efaf2d363664c6811cf4. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/SE6SA2281305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8769889efd9cae280129db82daf76e98b27febea9bca3000d023a899ec2d15. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/SE6I32456406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e032cc7ce61a6bdd28f898b4df201eb2e6f1a12fa9264b7adedbe3db5b59192. 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/USHM22518170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4d66350d94efebeda6586a4432d3afc1dd9876b6339055c3bb62db04390339. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USHM21476238.