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 0x8d58a6e5a4c199cf2037835ea5310a9bde2af3389d85fdc0281f2a3a2c816e1f. 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/f7eba142-2865-480c-9964-cb407fcea360.json and https://artists.proofprofile.net/proofs/artist/f7eba142-2865-480c-9964-cb407fcea360.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 0x4d26897e6ad8089a5bb9f12207b0beb20b1d972ce7e7b2dbcfd273a39721be4d. 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/FRZ038901290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6239777cab2eb136a3c30f72822b23913aba9e49435f273dbbdbc2936b11e17d. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/FRZ038901900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a17b4c7faeccce998a826b726d0d8798bfa37d9b0a766842025d31b0b4dd91e. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/FRZ038901330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad18ba281c1df3d54622b2df9ed8a375d4e02f5f6722734f9c72850e56596073. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRZ039001380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bfb5bf6b0e20e5ed291ae49c2e48df9f63830ac2c1b1beb00cca0e5978af928. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRZ039001390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fed5c516bce5b9f9cf85a7008d40d936f9ebb09fc13d0f1f1a9650f7707925d. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FRZ039001430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e5cae0ffd71ce787b7b8cf92d10d6c428ac578f1e5b68951ec65d68f05add2. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/FRZ039102800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5321ec821040d2d089d8581e6857969f0a136111fb8a89e523fd337da7d2420. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRZ039102850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf91916e04a328f8c6ad00d384b83e16a72fdc8a65cc5dad6a947b01f399d8c. 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/FRZ039102860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cae174d06e21eff603c6389ec5a8de5f14b1c3bb80de2db8c2764f7faaa7a77. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRZ038901350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897d1e540b1617fb8cbd8d6c769c4126d76ec36905726ed706f7dce40fa565c9. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/FRZ038902430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d2852a2df363b80375115692dd494d148b9660cd41bd298ad0673e92d6eb72. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/FRZ038901950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6486465cc5a4c84725fe39c87ea43bad717b355631f87a2d9698af2c31f93813. 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/FRZ039004980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83234d34eadfc9de3a355ef6749f22abac7af170ba87df9807795ad697d87939. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FRZ039002610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d213d206d2c54c3b2a63eb0babe2f82cd9a832253ea8d4efa7ad8de912b99ef. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/THRSP1230717.