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 0xe8320a59c8964b9b0c93f8f375f948e0fbcdd53ce32f0127e956669afce1f56d. 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/a02d5a77-3072-44c6-9a54-a31773582806.json and https://artists.proofprofile.net/proofs/artist/a02d5a77-3072-44c6-9a54-a31773582806.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 0x6e20eb9af46c9411f828f07cd7a27520cfe86e0169ee98e140a97882be9d0480. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T04:06:43Z), 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/US83Z2470040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c75544e0c01963b85f6b3f3e2580375010c3718b925ed7db583e8b19abee65c. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZMHN2462957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c75544e0c01963b85f6b3f3e2580375010c3718b925ed7db583e8b19abee65c. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZMHN2462957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e9e04bc104971c11aa66954c95c83a1251f11ec164b6503f6fab3e22cd9331. 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/QZS662419281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e9e04bc104971c11aa66954c95c83a1251f11ec164b6503f6fab3e22cd9331. 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/QZS662419281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe938d8b071e4b553d652fa3d1997a644be7d88e5f4663a133d565804fcdb5978. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZS672496318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86027007d12fcc0056f13e97c31aff4707f8e46b09f269846fcf4675609af603. 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/QM42K2420735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c47989f27f3eb9e0d51c8afc0f9f7368c6435f0e72495ec19830bf661fdbf9a. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZS672404899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c47989f27f3eb9e0d51c8afc0f9f7368c6435f0e72495ec19830bf661fdbf9a. 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/QZS672404899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf402861f3b40955c8fcc26afaaa0ad3e23cfdc49d9603ac028e4b8ba963e388. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZS652400232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf402861f3b40955c8fcc26afaaa0ad3e23cfdc49d9603ac028e4b8ba963e388. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZS652400232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3379cae846faef3aa96c4fdaba8518c3cc527aae08977a3aaba72f749c368cfc. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZMHL2502999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabab2a2e2949cd1d1bc2448d8fb9bf9d55df7748e3c343083eb0d7172a4134c8. 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/QZVEM2542479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c022a2c7f6c670efc0fc0376e8516f234a9d03d3ed59512086aa8282d071877. 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/QT4K52563377.