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 0x4d50b6388cae2b71d0a17523e6ea9268a6570e7ab755be0a779b09dee90d818f. 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/07154b09-dbc1-42a5-9e03-77669c363738.json and https://artists.proofprofile.net/proofs/artist/07154b09-dbc1-42a5-9e03-77669c363738.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 0xeadbcd17e04ba0b5bbd95b43a78c2c99a9b35a6d2fcef9c2fb44c0f0071f4866. 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/QZK6J2004938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdad9dfc7bbeff63760f343c40dfc049add3b460d0e405093314d9925e6ac1a. 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/QZK6J2004941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7d7c11c40707d9db54eb7d6b54233e11ce5e3ddf8438d34b19e416923a450f. 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/QZK6J2004944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28abbb47fc6b339971349905b79395a8e16253a3facccfc68802b1824db541af. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZK6J2004946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40efe1dcafc2060b7c1b2cb8344c19c54a35a456c331b81899bfb55fd893f983. 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/QZK6J2004948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c46029a71ff610d8d8ffd990e4909a144f0500f8bd78ea83d97c16751b8339. 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/QZNWZ2213393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53eda00ffce1e7f5058303c6f071284913e23359dde02dc6e85b95683540ca7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWZ2213397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6bed65840f263eb30dd1f569bcfd74de3eeb1059b78ce99f193ad5e1d2a036. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZNWZ2213403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046c7ad500d603a47d4ede5a80bcab7938e0ff5dc373e3b248f23cac4694af5f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/ZA2G12200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c96cb20b85e206b515bfc4c5506d6dd3ccc16f985a0340a0f30543a4303150c. Chain 2 (Bitcoin): anchored in block 958681 (2026-07-19T06:14:54Z), 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/ZA2G12200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9823206969116859206ef9316a2f44197ec14fe9f2c3111d4d531ef53da53f. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/ZA2G12200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1592424adf8737c17afa1003086b5ef73b836b1a418da606128a8520d90ba9. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/ZA2G12200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a96b85516899cb30633d3ed0559283e09f50c064b54c23cdeb0f133b5f33d9. 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/ZA2G12200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4912793385f8a7c21c8808344dae493765180402ba74aa523351a12a7c39d695. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ZA2G12200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ea41f42c47aeb56a37e277d7cb37e79c9a09928a2a9c660176746f3f99f54d. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/ZA2G12400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf205630ba436281d8e331f9f6370e9bae77a45f2d4f96f61c05ab309b39e56fe. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/ZA2G12400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ce90001a25b9ce08a22ac6919364fe26fc8d40feb5d9fc0f73150098a02ad8. 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/ZA2G12400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe056b0c8380a30625c263809fd5d970dc8b79c06179e58685851e35c5aa8d5bc. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/ZA2G12400041.