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 0x59041e18687498f2f6646bf9b5bbcff05b6b69035fde114d68a816f586bf4d66. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da570400-8c6b-485a-b231-edd9e6957a71.json and https://artists.proofprofile.net/proofs/artist/da570400-8c6b-485a-b231-edd9e6957a71.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 0x6244564da6e34fd95569fbdf9421caafcbc6d8cf286cf1664cfdfb55bf0a9d9e. 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/TCAGJ2235414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cf80f61450520ca0bfeb6a65998577c666de6379170a133aefad815d865065. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAGJ2235429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0226f72c1b91de4ba0ddde7b263ffd3bf4d961b0291ba11aecd0386051372e1. 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/TCAGJ2235542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f51348034d074d943b9a9baa6b82cd334fcb20d9c10a89f89bb6d2b3d4afe85. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAGJ2235563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78b2dae85e12d1f8626d50b482cb60f84af1b57fe40ce9349fab5043b870191. 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/TCAGJ2235569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3662f8f8dd7b7996e3cd71af1dbd35c46a2c46e51dbf3826c9d8c0911d6dd3. 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/TCAGJ2235581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2623f39dddbcece7c5c9c9880b033a05e5bf8f9e2b7f0670e4f74f6c8700b745. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/TCAGJ2235590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a0e1cc4bb44fbfb6bf9b9f520cb9ca1032229ece006d0a9f3610ffaad375c1. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TCAGJ2235622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976c598a49ff484a3afe21f215e70806a519ff1ca71b2a5ae65bd28b49eeb2d1. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/BE2OM2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02df2155ffa785b8795a9a5c664ea375617d7323d8cf98e905fd85b4fbfc1fb. 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/BE2OM2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7709b03183388fe0003da890f168186f54b6dde7f720b4d699a5233ea600724d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/BE2OM2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5278608c6b644fcceae55ab2bd4ac682ce799736126e3d2350717bb103ca51. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/BE2OM2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db8486b318b9701710698d06886b798a96966a38b0ce078d9168bb8e4228d13. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/BE2OM2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976c598a49ff484a3afe21f215e70806a519ff1ca71b2a5ae65bd28b49eeb2d1. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/BE2OM2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ae440cedf9e01de7f536c709000f0aa369398368edf0ca62470c82b2bef320. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BE2OM2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02df2155ffa785b8795a9a5c664ea375617d7323d8cf98e905fd85b4fbfc1fb. 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/BE2OM2400008.