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 0x42dc31ec90f55d602b6c087e836d5f5140ebe12e773b9000f77594437306e8cb. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ebddd687-6186-4ac9-8171-9e59ba2cb7af.json and https://artists.proofprofile.net/proofs/artist/ebddd687-6186-4ac9-8171-9e59ba2cb7af.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 0x35f46b247185d124249b4e5a51f5ded21c15e6bfa630b93a10ceffc3a8443c8c. 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/CAA0Q1412315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3eb6a07ea357c9540ed1e539fe8accce8b2905784edf05ce148167801f71b5. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/CAA0Q1412313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7edb6e91a6aa1dbca18063a57dbabb196851b4cde8ba0aabf0694824f6c415f. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CAA0Q1940006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7978b6aaac3e9dbae2f31dc3d9cb2799acf757fa761d237ff039ce235de7986. 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/CAA0Q1622332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5f24e157e177084bf6496a7bd6d6cec9469049686f98339df662e1bd1f847c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CAA0Q1622339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc81da9836b06aa52de1bd9c073d9ab80f6715a995bd83807f23f1cf55aea06. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CAA0Q1021894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ead2f1da269d58ba773bc97706704e156c78ba87f111638b14fdbe351e82e44. 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/CAQSY2100051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c918811c6916c4bb7a10d4cf664946e5a05af18e00c63eada908eb3d5908292. 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/CAA0Q1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ecb8c995513908943b8d327d1f1379b18304ea95fb833addc842e6c7e7f799. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CAA0Q1500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad25481617cd257116a6e4e56d175a6612b6330b8d8af4bb94910ed8a5d7cce3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CAA0Q1112708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df44722dd59cdc8f98121ab819c6d0f95c0ad444ed2ddcddb8043c65d70084c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CAZ700806283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ead2f1da269d58ba773bc97706704e156c78ba87f111638b14fdbe351e82e44. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/CAQSY2100051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3a960c7e14c81b15040c3efa3e4c687575cbae4ff4616918ab639c06ea417b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CAQSY2100159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fde57b5c9c2b23dbffcdee7e078249ce7382a36d418f61ab9a120e661f8da7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CAQSY2100166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b51545698341c8cf4b11a8e60ebbfb9d93100bd1a2f7a4296c53522df8d4501. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CAQSY2100170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a842f37b49cd77d353dcc4f9bf50542e4b7d3e1cf0cfa34b072b7f24db4e5da. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CAQSY2100008.