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 0x0d074bebd49802e86bb045b3159b547804dad8e4d98fc09d02f656bf45ab8d5a. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/26924f6d-f644-4f6f-91c6-de6f6da987ed.json and https://artists.proofprofile.net/proofs/artist/26924f6d-f644-4f6f-91c6-de6f6da987ed.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 0xb7d6fbc2158a23f8ab8ec96db88c5803dbc140e298d3551eeea19649aa4653d4. 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/QZFZ22113661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb86098505438f38c9d350c74955b1bf941ea842cd7c98414d0e29695770a917. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZES72209849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3451d79bdbd7354c9065cb9eef8f5e48d86ab2e183d4fe0251daa31dfc806f. 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/QZFYZ2378270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf50eba8cdcf7c027453dbec3aba8b768b19d23cf4776e66f3db3fba3d8e7f42. 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/QZFZ72589558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde642e6502accffb664bfd0af8163fb32663650cc97117bf518c0e0386d97e53. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZES52554710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bab91187ea3c44d7ace9d89ad17deb5d642ba004ce0a02e3968e5455aa335b3. 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/QZES82549186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cece06716758d9c5b9bd465ca84387844e30f724369f38d90a62ebc67d5d9ac. 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/QZHN42580938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07cbec3d96438acbabee920c1d2e42c9e49975bb0708297d9698d06903b388c. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZHNA2582708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9765eba495cae580f5cf95169f153803e1a073107427aa7b991c8b81e6d989. 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/QZHNC2577716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eba7d7f869a75787b43c4a29107b9895d99eeded2e324709e43d8a8c019a793. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6N2541179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50be6f03746fca09e2ecf1fbe6114a17e1654088123bf271634ee0beb817a085. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZRP52558549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e7da4d45ae3f804c4369628ff5b2e56f343d9cd52ece1d0238e2788e8a2567. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZRP52558550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea010fc09e69ef83e3b0144a19bfb3f4b0adb0f577b13e42da7cd18ebee05ff4. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZRP52558551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b4a3b00901006ab4c1d6e9ae6e8ed37a86c88c281de23eb93d2f444c5ae745. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZRP52558552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f8f55f019cbacd67b29c319ebbb579866d403e3096139b55faa74e7c62a100. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZRP52558554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7730928b0784c252d1d2d355416dc7de82860d70704e1180d6c229395b68e5. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZRP52558555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527fba95eebcf6317eaca1e8846ee2d3302c85629097f1874266a7dd36757924. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTB92590864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aec6031c7cfff2190488a6ada9f920bfdfa7de88b090ea06706d2bbd98bf4e8. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTB92590865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d449b245b5250648ceb878a74888f01489726a348d156bcccf8c774ab0427b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTB92590866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa704856e8a37f96798f9b3c89b9f03be194ec662f78d245c0f474078dd3da0ad. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTB92590867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1fa8a75aaa660e2441b789ad33569e277a518e21ba92a00c65b97058cc7fbb. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZTB92590868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf60bbdbcf10b59d71c9a96e273cb3aacccfc8bf888eccd35c16e518bb9cefe4. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZZ7P2547429.