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 0x0cf54621db3ad02724c0bf566aa7a73b5336acb081bd223016cb5d94d1c8a9a2. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2237d781-8845-432a-9bce-804a11eee0cb.json and https://artists.proofprofile.net/proofs/artist/2237d781-8845-432a-9bce-804a11eee0cb.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 0x69f4c2376e8fa8b9a6ee90bfa10e0e996d1e77c238f0df3051113f0ba5a7b932. 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/CZUM71900294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebc0fdf802d9e819d707ac1542d57c00e66852abca2f4b1c108bb19ee71d7d8. 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/CZUM71900531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13be1037250e624921c0b75677c2ba140689a810dfc43882a9ebcb243d324b00. 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/CZUM71900532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a092c055e185c99cfb6486e9b37ecf0e54c08a20c0d8fee149da176eb0c101b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/CZUM71900533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e83b7952d0607699ca9a9583fdaf670df51a905a034d94ca48fff88a7f9575. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:08:53Z), 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/CZUM71900534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca428769031d7cae05be4d32c6a9af02be7af31f831863e71d7a48282d5c75da. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/CZUM71900537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591c7f6498a448b536bbb9a7bcae0ad62c052b8d314f0403952cbb5d4a444921. 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/CZUM72000307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15006b64cd6f496b7b257dcd3f98fe9fda924e771f499fde03121c60e387f15a. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/CZUM72100148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7208b673ec88d81702ba97f5a6de9d7ffccd43439f3279d047d79ce87bfaff41. 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/CZUM72100149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe476108bea72f991db84eb19887d355f3b0a2c8e625f5bf5dc2435568ba8ab43. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZUM72100077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fda441dfdb42a6edad23222f6436883668ade013710cc3947d7254c2585dea8. 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/CZUM72100150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0087bd96ea9f99a0ef0f94bf3d67a14abc43e21d8723f68d9612037d649f2ab7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CZUM72100152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ef64b46c4082b7bb8df6dc48fac334cf552adb9a544dae42840e28748e3295. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/CZUM72100154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e16dcd594a01b5644608b4bc0a72f15b1e8c5ea751c5a6610468a4cbb899f5. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:08:15Z), 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/CZUM72100596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d67be4e934b141d708c14dbb3bdb03ea495aa9b5fe36d71cd466b8acd6aa0a8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR2X42379550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7280d346b8e4579c31416b4e4e2fb651825462731644e2dae6360275609db2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZN882185225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d58072a9fd841c9fac13ccaa16d153611ce26114993e1ac89a8748b7b02a41. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZK6Q2466497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f7541f1f7adac5b12a8c8f2511444547d97e061884aa70dc44c5735dc1a33f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6Q2466507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8afaf5640012ca25832c5609d76fde80110592714063c687e61c9f78253a02. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZYFZ2481027.
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 0xcf7a036bf7a63b313e74f13c38831e996aa07dbe26a4104e9ab41836774616ce. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6Q2466498.