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 0x5e84c32b4a5ac5efa0e279331e13a462855179ca369d423ab5bd1f8450973bba. 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/5d0f76ce-4021-43ef-a00e-64f54b84e7e8.json and https://artists.proofprofile.net/proofs/artist/5d0f76ce-4021-43ef-a00e-64f54b84e7e8.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 0x3774e1dc6a02cbed1fa5a0fbb3b6163190eafd4d7be96108e3c1e749796d5860. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ZAY361600418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17dc79c5c3a3ee03daae1eb0eadca6603b18cfb4d3647a91af07341054fee17. 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/ZAY361600295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca737e4310d10893d178bf521b96a74908bdc4afd997ef001e6921d39fd52c1b. 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/ZAY361800472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950cd75bcad01ccc864d18ff8e9ac04ac3ff2d2ad798f293340c74cac5eea39d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ZAY362400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee62ed6f3c9530e7704fee8b5ef617f3ab6ff8cdb13d838e28f4efb881b579c0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ZAY361900531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbb942189d3d1a97c9f82bcc4b5ff53160f978347dc65e11129e2cc3fa410fb. 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/ZAY361900533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b67e9cae5f2a85bf6cc87cacaa13828a1815a77df1a89b3da40ab23635528b. 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/ZAY361900543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042344bd0c4fbfaaf0323190de74b25d88a09753d5b820ff63506e8b23820b40. 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/ZA61A1304487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b40e82d14b2f351a68eb945d8e1c2a46995d40035b22d739f193d3ca5193d15. 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/ZAY362000640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2322349d94140ce24eb460d017c7fdc4f2cf1a230dca3989d2d906309f2fadf9. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/ZAY361900555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a74e5a4f4fe29a1737e3d5829e77fb9f83f5f5cb27d30243f967fb09ea8eb7. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/ZAY362100682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823048bdc1d6b45ed8485a5d0a44ca95721d774838fdb02752d93542bcef3285. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ZAY362100685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f1e390e1fa2193c318bea7001b0fa777895fdb928e56575b207d8e15d1000f. 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/ZARM02300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313c573bb94dcdf00d19213f757119cdfa9f41e4c50c1b286e326c5a87e4864f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/ZA61A1304557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6289411fab963c33773ea4cbd7d1a14c45599772f5ededcf9235111b9853e6. 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/ZA61A1304561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a774f656af15db1cd9b4a9980ffebd2d7f855217871e610f50bd62312ec59fc. 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/ZA61A1304563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5d3abfc1e936249b96dd39a384470a7b80566ec5234a2cd2a88c487f39dd92. 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/ZA61A1304565.