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 0x8e9c66e2cea34a3010ff3c3ba1653ec7c5e13d00099a9297c3b9fdfa650cda9b. 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/12f2cf9b-920b-454d-816a-58b603526f8c.json and https://artists.proofprofile.net/proofs/artist/12f2cf9b-920b-454d-816a-58b603526f8c.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 0xca741bb8c8d9e3c216090fdc19bdbc6cc564aed47e42599de3d524959ea61d40. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USDBB0608893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05357edd43ce46303731ee7e3ff1d4f5a46156c67d6486e19398e031f375f111. 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/USDBB0609422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfb24db537fa7ce9ee1ec2a5a0c6839410f706290ce51d6c7c604449162f15f. 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/USDBB0609693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8329d83638c8add4488e958538e3c2f2b133c8a235b4f042e987a5442057ee35. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USDBB0608147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9910e1688aac86e8cca551a63f1986853f9904fb1f219ef798b4e0c1ac737f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USDBB0608940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879bb03b770e77a413fc2b420c92cca306945a6cc202f508168b7dc6fdaf56cf. 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/USDBB0609225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d44de30c52b33adcb52c8c3e3f28f9aa410b63fdbc92e40717d7530bee36ef. 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/USDBB0607532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d12d8a56d45e14cc96d1813788654f8219ff96112250dcd522e64d3e800e640. 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/USDBB0608474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0408951d11073fbcdf8a67000c0d7b66c67c8d867863166d17cad8b31fabfc3e. 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/USDBB0601476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22f0506bf59bb8e8aabaa708605dae1e7bcd6907b0bfe6719a513840ea3e87e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USDBB0609921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5464defa88d8426e1f321502c5ee1bf1e421180310c212e2cb6de680aefd5903. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USDBB0609967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7a51ec5c94a7a26dd8b77e774b820279854b8f4e7e52107f3fc892d25515a8. 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/USDBB0600825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3f5babe5cba30bf4c6722cb8652cff559fd745491dff237c093e64ea571631. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USDBB0610100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f943f1514d93dc61a3fb1b2aeb876f4af153d0aabd5d3019bc1f69fcedc06f0. 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/USDBB0608920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320c51546fc912a5329c2ebbf4b5888de7fa5eba1069c6859bf221e075d718f8. 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/USDBB0609181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b40f85d9751cb5bd114882efe3505fccdaadfd85ec16888be1dc9d58f7376a. 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/USDBB0606690.