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 0xf6b72edea05181cfdd938da01bdb7d0ee68f1c7507eb7145f4454082f9816ca0. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/724fe4cf-d89c-45b1-beec-3fac3f8f9c39.json and https://artists.proofprofile.net/proofs/artist/724fe4cf-d89c-45b1-beec-3fac3f8f9c39.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 0x2834dd1510cc4a0c49626f0f4a4c02fe9080a3fc61e2f32b27a463c16f7c10e3. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/ZAX4D2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60f367467f793f407795df6507b3f7cf2f79cf287641b8f2ee5606cb9f1b335. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ZAX4D2300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172e4de6f8a430a9aa96a8b766afd7daf33a4f78e1f5cc5951f170b3ddc71a33. 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/ZAX4D2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df3e2458bf0e3daca25b90e2fa927e3dd25cb33f1e0268c6a3dab352e36d207. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ZAX4D2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c93e1f410bc93eae5876a622fa5edba603edf738b858d3ed763f8502a1ea5f. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/ZAX4D2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952183c3a386ea3a0615fa7f7b70aec4e372aaf6026b04007eb5e229715b3a94. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ZAX4D2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaac2f346bf4948e4a1263f164b58784f14e82ebc0e31ae70dc93c0f4ed3bb11. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ZAX4D2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3359edad74bd3442f10c494182b8660618a12498498d17f8ff787144987e46b7. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/ZAX4D2400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f7dcb07e26aca691e4b0c5953f29dc7d180a9f5798d0d61030c19125f844d6. 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/ZAX4D2500050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979e8e29a3dd352e9993bff4f66a29eb8f5ca3069c7f9769e6ac14ea98dd9cad. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/ZAX4D2500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7309bbfd6d788889b5995b754fe7f9960ab6c0864dc34475e8ab490c331aaf13. 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/ZAX4D2500052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bcfcbbc70fbd8a715f19d0fe9423c797725347c25d3fcd190fd999b5213805. 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/ZAX4D2500053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5bc2c660bcba9cea31e25cca7c6a9d49866906cf3f776f217ce3b6ffbf8a23. 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/ZAX4D2500054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c4b025a91fefc4d39bf416b045e591af7b796c06a34ecd574332c0ff105b07. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ZAX4D2500055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e83fbbc5208cf95ef610727e8f2f3d993a745a3525905ca8115d3233ef8a65. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ZAX4D2500056.