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 0xecac3d3cb1f897f3f8858451f615929089ac25650d16e943d812a1d4fb8cbd03. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c235754d-f62a-4976-af70-88ba85a0212d.json and https://artists.proofprofile.net/proofs/artist/c235754d-f62a-4976-af70-88ba85a0212d.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 0x309f9d5d03563195fe4e5e92cf614e5fe854aa4fab90572b0f3a2724d679ffc4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/LVA109700128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe70b50cfd17e78062a9f2eef527a710df4b8e8bedfdf0365581b8a17e26248. 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/LVA109900120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ac0bfffc92b1ee88c5728de05f68116244d38dd71acc6552030f071400b19e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QMFMF1482535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f1e61ae21b965f8e8f00842d0baec23d6d32d0c495c52773a1c6e164beeaaf. 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/QMFMF1482536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef20dbc776309e83548ef892ed5a32d61f27dc7e9229c83f6e0be1a0d15efc32. 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/QMFMF1482537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914bcabc9caccc1e8157cf0445d6255db24023a33edefa63f98d6d595069a039. 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/LVA100600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa815211340e8d29a309e923d0955ea3ec72eb7631ea317b7825a37dcaf32962c. 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/LVA100900057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b32ff990321a792703a81db64a0f07fa1523692f60ed87e5d32a4db6baf37d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMFMF1482538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f491280828c767d9fd163e8c56f1fabba915a8e31faefb20d1cd2ca2a36d38. 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/QMFMF1482539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67f171e565db54059c35d25405be8df004ab47d163046fa2070fd99ce2f545c. 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/QMFMF1482540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057b5a43ddabd7f16f31376df5be7bfdd60af7797e37943c4eb6032e2a2dcb22. 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/QMFMF1482542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050498d3fdb2f051af00c5229f7d5a58a5ee56745f0d46d9d7272c40364d5ff6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMFMF1482544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcd4ef9b0886b713b94d43524b8d6c0c9b5b47547b4e8b6d3e371e7fcd679f4. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QMFMF1482545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38a374b135a58b2bc7b40900bd042b978ce47f32074f6f02c7a4db605c4c9e8. 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/LVA100500225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edccb82b25a86efc1a0561a512afd2109beffab96a16067fe15a7c4e8ad3bb7. 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/LVA100600115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44cb44ba73de268fcb791cf92ec968aa679b6056149b887a8d8bff217786387. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QMFMF1482546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206c55a6e4081eea5e77f61046f7911d07ffd3c3880177eee579917c291175a6. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QMDA71325087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521bacec9964d26df8545441cf30df2327461cd6c532046fbb38cfc0b69db605. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QMDA71325092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65524358cad350c9a1cf70b718d97a98a8fd5cc5e4b93ffaa4048eb6e806aac1. 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/QMDA71325093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14d3a6524fe6fb48235e235dad9401fdb46f5515100712cbb6cff68bb82cabd. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QMDA71325101.