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 0x6ff8e64977338fa87795d9f1de700b68e0770aba1a132ecb48e0c0272bd6700c. 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/0dc3baff-296e-4f0c-85a0-bed556b64ac6.json and https://artists.proofprofile.net/proofs/artist/0dc3baff-296e-4f0c-85a0-bed556b64ac6.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 0x108d663d7d3963b0496082b8f2c3cb01f22fe240d08c9adf8c649e6743c9b3a6. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FR2X41820968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed63f6cf81e0528e3932359169fcfaacd1696644322784888c226948630ddad7. 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/GB45A2001923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4297c97420dd904550333d29c9e1f68cb4a3d01ede9c72016e0ced3e5a95663a. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/DGA0S2411898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e1bc712df34f0358847fb0ff713d54967ed055fa206feb8dd55e68ec74dac5. 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/DGA0P2494700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e1c957c413d489a48ff3c6beb0b23fdca0ca75fabf9e37641e290a9e746450. 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/FR10S2592040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f39e41bf60f4c13999f316255488ebb92a056f0457b15c94b4b10bb1879f517. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DGA0P2497504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e1bc712df34f0358847fb0ff713d54967ed055fa206feb8dd55e68ec74dac5. 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/DGA0P2494700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1c0bd8719c14daf1effca0843d54d2c0760df5d835e1529facf416e21fef1e. 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/FR10S2592044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1723f38d808952503c5010f37bf5686c27372d9d9933795206aad5491a1eb889. 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/FR10S2592045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71d8d94b69acf5ee2d1b8694eaeaca09161ef402e00a04150ea459127f7e851. 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/FR10S2592046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bbebc43da55766e635dcdc29b5789c20eff1d2449c9b23abda6b34108fbd7b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FR10S2592047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4297c97420dd904550333d29c9e1f68cb4a3d01ede9c72016e0ced3e5a95663a. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DGA0S2411898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b02d2be3412fe1cd952058816dd06e95b3ffd00306edfc3ace33d04be29f55d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DGA0T2463912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cac13297d26e0badccd92f5de92213e48a74e640ff1f73837d5a1c2a83e9003. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FR10S2592048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc53a840554fa4abacbb1afc0fa9d470d3d50061ae1ddf541cc688b6f9c5e3b. 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/FR10S2592049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc324c7f5b3473fb0e42f5a2c6011b7926a81828fa1bb0d0dfbe39a2df75c2fda. 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/FR10S2592050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b523442ae2d7c856174714adb598606c2dd155027a0ca1b17e48b86c2272ddf. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FR10S2592051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71d8d94b69acf5ee2d1b8694eaeaca09161ef402e00a04150ea459127f7e851. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/FR10S2592046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc53a840554fa4abacbb1afc0fa9d470d3d50061ae1ddf541cc688b6f9c5e3b. 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/FR10S2592049.