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 0x93e030fabf433c3ce21a7e3b7d41104258c258af55b790f274a784b073ab56f9. 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/d1390a7d-09a1-429f-8c65-bab4383940b2.json and https://artists.proofprofile.net/proofs/artist/d1390a7d-09a1-429f-8c65-bab4383940b2.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 0x192d0c28f13fef610c8ced4d6c6da8a25a27c4f28eeb7bfc4c6352da3ba3c84d. 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/TCAID2413404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268c3ed8d2cb6f3a9daf0cd49e8dbd2e8932ad1c97f7338710b30f9a5bea469d. 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/TCAID2413413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5b3e1e0447686b813d818a572f608872844996a80b2ef494c9df7b8c98f325. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAID2413426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad473ffa80fee2ebc086c7e96e29666b69acda1a634debfc59bf6bb8b3f6d1c9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCAID2403821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad473ffa80fee2ebc086c7e96e29666b69acda1a634debfc59bf6bb8b3f6d1c9. 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/TCAID2403821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d301996698b51071b2ae81798607ead40edafa507a29e5e1668da09ff80ab9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/AUBEC2336649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f86d5001bbe19758214c1fd26b4833a53623be16e6018e20d86216fd5b2fe7b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/AUBEC2336650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8f5cfc3d81e8e8d2f5e1840266b10ac5ee5d5144dfcc4bb85dceb1db85cdd5. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/AUBEC2335512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68975db3223c86daf03f8652504a6d7ee4a8e354d158cbd8763fac229a489906. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/AUBEC2336651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f81da33dd9b8ad34d4682dbaac971c698e3f796669b67054c4d54b9a7284e05. 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/AUBEC2336652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bb8eb3bf393d0b6155300ed1c99094f3e472a55192657e346f02c02075bdd0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/AUBEC2336653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8f5cfc3d81e8e8d2f5e1840266b10ac5ee5d5144dfcc4bb85dceb1db85cdd5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/AUBEC2335512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03cabf9ef08d64bfe41dffcf2e219c78c5a392baed4040cc3f6972e0c918ce75. 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/TCACP1604906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2c8241d35e4314261b3fe836b0542fc8a96b845089b52ba26ba3a235b1bb61. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACP1604911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe42580ef8d4da16abe5df0413d68fcec4e588515c6c2f75bb692eb61bb6e657. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCACP1604912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa924a10e012f7f00dac9434a86e3fbad0527fb19dc429939d6b0c765ea033b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACP1604916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68ee603283e9bb4f94b8c8f7759bd6866db166f636c88ed59c5e3f5028e9a25. 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/TCACP1604921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450ccc2bc27d11082430aa87e01ea834985b57661ec34664104489acd1fa5abe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACP1604923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa106b52c1a492f9d38f57fc0a0a589dde439cc2738a11dcefa89f4cd8ddf08eb. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TCACM1679275.