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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0938cf1364ed6c9c27110e70160b3fa4900e8ba1e315c6ad9176170beec1b953. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01a8fdfe-08f9-4fed-9f1f-a66316eea19f.json and https://artists.proofprofile.net/proofs/artist/01a8fdfe-08f9-4fed-9f1f-a66316eea19f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d8f1c08820b40591e45d2313811026355b35bf668975c05000d85cc963c283. 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/CNZ852200615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c7e0643a61e2731090458e785e988fc1c5e85e6cab3f6295534dde20d417fe. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CNZ792100739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f05167afd5ef3fc434d4bff5be30fab21fa248de8e0eff419a5f81d659a121. 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/CNZ852200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2cffd131b4ce8731dec3854accd0a187e783a488c999ebf6c7de2dfad84bad. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CNZ852200035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c15f9e0fca2bd358a6f0961e16990ba0e8d653322e308364ec2bfa4a7a194b0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CNZ852200389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4c00a909b8148de334de326ad87679a657e9e71013b70e80d13017fa0e477c. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/CNZ792100738.
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 0xcb6664a56172b0f5abac3aec389b7c22b4c547d7f4d0c7b0291ee9296c910173. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CNZ792100749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27282e7f22b28da844c371bc18604c3177f0504869aa60ba9912f510b427e026. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/CNZ852200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26def72d1921e3f4f81496d7fbeba9698d2a853f8005842f7da36e2a4caea7d5. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CNZ852200392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ee6f44ef0f21c0eb44288e43fcef9e4caca2dff435375db34c2a6f1cc81852. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/CNZ852200390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e6ce9888776b31462d6ad3313138df7b3b50d63d12554730282f3497defd68. 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/CNZ791900189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c91117474726a2aaee285946b902bbe2ebdcfe0310b93f847491c0e1a42c7f8. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CNZ791900188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d64eeca37c5424bcef7c2bcd77b2eaf891bb8923ef1eddf2add64277902da7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CNZ791900187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf2b4c5d0748c175fb3fbbf5ee060fa26d7b83a973976b22fc75064df5c7eb9. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CNZ791900191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97af7d6bb5483aedd3cd2f9bd19cedd35f9dbe27857431e09d68b3e79b0e7a2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CNZ791900163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4862a3b9a43869aa65767a873c262258b3a2aff0844807697b10c811650e16d3. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/CNZ791900190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc282dc504eb5c7c4a40aa6ab188896333d845bafa3ca04c646d80594d954cfc. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CNZ791900162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b6ad4f98679f45dc73a2a890288cf68c7d8747d8d90880d1bd9dc4e415834a. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/CNZ791900186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6d0042228c3c910c8da4b48c443f170c5b0ccb64b1d21c0ed1a643fb28ef64. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CNZ512300092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927fb7b4c10ce9b3913294a161ff94848a1c467fdc6196fa4c44566d255ab25e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CNZ502001821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277a3338a0fc804b7a46f7b68791bcadd530acca7294b6a16ea3f381f134bde4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CNZ502001193.