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 0xbd483e37e104aa9d11699df1209ad347fda8841a252adfbf8f654c25e5e2418d. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2111b48-1dd2-4d3a-b3cb-d8b81773c535.json and https://artists.proofprofile.net/proofs/artist/a2111b48-1dd2-4d3a-b3cb-d8b81773c535.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 0x65b846842df44421c8cec5993fddcac874c89dde0153101e085bba856a1733ae. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QM4DW1871797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ed3e51d85495990366b9ab936699b719f8cc7d70d13bd993f7a77f824e3271. 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/QM4DW1866703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d79ac0f1c52a3ffd64c580bae446b8cc68361d9bd95f434cb8cc81396fd2efd. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QM4DW1867160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa90389a358b1e3ae79f2cf20bc5af8c35a1690b1864bb6075712535def3d2d2. 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/QZCE61893004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9342b663998a6aaa527c0078b0223b23302cff37781aeae207234be6a25604d1. 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/QZB4J1836052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d376970b7f53ca2245699ad08c7448971fee92b47c85c0d0aafaa39046e4c5. 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/QZB4J1836053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7d2798c3f6534070719cb00088258e46b3975374538e6fad4cd6c252491a12. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZB4J1836054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e848c66a4328b8c36560005d5799eb8656aaf8695139fa0e1138da722561bc. 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/QZB4J1836056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece33a9ffffe5eb46ba0508784905678d79ef741d7c4f3c7eec19e4daecaffd3. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZB4J1836058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5c2377d56571eda1f598e0ffc51cfdb3615e44ecf127776ab8b1f535036c9a. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZB4J1836059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cc687601a65d9ce7578b642af8d62ffa40c2ebf2de50dbd395e97d737b092e. 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/QZHN41950312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d6f6772817433aa22165750cf1ec1655a841e2d8d94564c748ceb64abd25c4. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZHNC1962464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0efe472a76aca84f79f36984b51eaeb0474ca6a0f2423fe56592796862cd13b. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZK6N1925014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c3dd4476dafc2fb687f690c0757b33a317990ca8c389d70a1bacb8d8131e21. 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/QZFYW2027543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37a9bc08fab4da9aa9ce625dffba0733a4b76643d8c7662999a239ac3e175c0. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QZFYW2027544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0405fb0ed54cba204d62f651e7370b47b2cae8b39d2b461d5e405b43f5372093. 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/QZFYW2027545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8558126929bb2434e4b627ec08355f459a0a3d36dcc4b0b63c0001436756d5. 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/QZFYW2027546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ace8a6b1d4a4ac4d600e7a3ef51c772fc883bb31f22e060341cb48651e3cac9. 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/QZFYW2027547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9519ec60757cf7d617fa988a1b1b7b6eaa8aa2ff771549f5de43b0e39b94c481. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHN52036211.