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 0x1ec87b1650e2503fd9c6b815a2396e1b726c8dfea1188c47792dd8cc75dfa32d. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39370f0a-1d83-4153-bfdd-bad3bd5b29b6.json and https://artists.proofprofile.net/proofs/artist/39370f0a-1d83-4153-bfdd-bad3bd5b29b6.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 0x150bc072c6e4663b6676cfd5ce3ce5287ccc73517520ebffa20d60e002accfa0. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/HUA181932908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0983145a493fc8142fa04ca14448e6023f1719514878ef3e7fa763bb4694eb8. 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/HUA182218701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3377822752c8b3f90a632018bd662040dc84fe8dc7bc0c43a65b84f7cf4ac1cc. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/HUA182117201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8104e6468c2402baa10b39d29d8edc852765ffffad5cc3b348dde8dcca31aef. 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/HUA182015001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec4aa32a0a2a850fc07c8758ebf97e2a96fb0d4d4f451b272d6e7d780f06c5d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HUA182014201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa334c53f7a9c14ae6d468cf0c92728087227711671c1bbd3c8f32f1bb4073025. 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/HUA611900300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8241d8c498d42fe78b2214057589a4d7553f61bca59343f5936420b281e5f48f. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/HUA611900301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9a83436d2cc285b7c42e9de92e406a123963c19d982556e0d8a3b73730cc5c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HUA611900302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbc7a221b599eb77d6585e0fbddf0adb435720f62abb55307c002be9c825f2f. 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/HUA611900303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b979b4cc9a3e69ef7166b5aa97168aec0a17ccc34d6ccb0d6488e8372de00b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HUA611900304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa890011e583e3f545c005e29585eecc34123f28cd67c59865cc3ec3976e7e348. 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/HUA611900305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6c9a47570396356ec5655b82a7ff387ec92c5e119e260aa72b4019de18c632. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/HUA611900306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4cbad8d6b94385e3a708b8e3b66a21e2f96d8f42aaeb8f689e30e66079f613. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HUA611900307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012c544b71301dddb92af158e20c51f7907a55b46db5c6c315b872657b09aa71. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HUA611900308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7765e628f1ae4bbab95687aad4708c495b77f0d589d11283bba805a61941cecd. 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/USCGH2536998.