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 0xeafd299bf8d5b289f7fef271414769cf61df44aac9cec23626ac915f7095c362. 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/fee73ac3-ad89-49aa-8ca1-b90fa0c5b4a6.json and https://artists.proofprofile.net/proofs/artist/fee73ac3-ad89-49aa-8ca1-b90fa0c5b4a6.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 0x03f7563dfaa7d2b48f62ab52ef87ea87b46bb5d45cd9d9ba19df04b572cdd29d. 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/QZFYW2124740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9cd117344d44c676aa15ec8c7d1299d5d26849325411f5edf6fe624b948c7f. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZFYW2124742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53f1a4c232f80e40698306358a1129e5a2b116a1ec9edbd6c4d98fad9dbd599. 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/QZFYW2124745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94eabd5942f2a6305bb695f1afb6faae913c54f8f5be446df156d812327b442b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFYW2124746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff1e45209ff39c113ce0734097c6d6ca4c6faca099eb3610e05336744f36295. 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/QZFYW2124748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7eeb4257c52889afa62755ce4797c19d78bd8470637a07990a9fd77302bb67a. 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/QZFYW2124749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83566f06994a6af02736129e2f04f070b0e79a0c6017d15949e3c41dd9871ca1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAS2474533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc203687c61a2eb5e9e33deeb687dc4766963f02cfffab85f0c84d5dc1b13cc. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZZ7S2445493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8271cb742036fa20d9f7318d44f0ba3099276da8a8da0244b703ae17f17cb8d. 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/QZZ7S2445494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f71d094608ae57b6c9671a39f7f76af013e58be15f6a0b3dbf01d1d00f31b19. 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/QZZ7S2445495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83566f06994a6af02736129e2f04f070b0e79a0c6017d15949e3c41dd9871ca1. 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/QZTAS2474533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9c21cf46ffcfda9f1976bda1dd0f94ed73b909182fbc7e0c47a24edf8ccbe9. 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/QZZ7S2445496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a676285ff2308f281185dcce02ca427546e7af627f91be146c920cef00999d. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/QZZ7S2445497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11f88e92f4d3569ce6fc7a8e0ea8d4827d90f527130f254d2d677ba555cfcf2. 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/QZZ7S2445498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd15b152ad8b9be6acf0d8782512e0e4c652acba4991effbff7e9e3c07f7399. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZZ7S2445499.