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 0x5afb4693c91208281c94dbc3bce59fa7c94837dd0d2461f6d4a6846f9c321c5e. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49ddd1c1-b953-436e-be72-28fc63cf3486.json and https://artists.proofprofile.net/proofs/artist/49ddd1c1-b953-436e-be72-28fc63cf3486.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 0x18b5cfe88b513c70ac2f9cc16cc4d5d3e57394fc7594fb1c00b5a7b6bb8ac8ff. 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/QZDA82281927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc798c1396a87e206c2cae375c061b825fdf5e476fbbd14359cc8990481957f88. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA62283282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ddcb81b30d97d9be9c2eb8b7d5ced241717ea4026b9c50b78b363de4d880cc. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZTAT2176871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfddf79dd75bbe6b4573c6bc00a327b8172cad4d2b1731febfc65be8c89da4a59. 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/QZES52080941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf020c6e7f4818e4864803d85783177b3f5a89707ef461d2796ba31d52e37a0f. 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/QZK6H2250414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb26822533903ed7400c30fe4f40716beb713ba2ab1bb5ae708e7ba9775895b7. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZK6H2250415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e39aaeef2467c0e2dce02d54ffd638f31fde035eebe9aa28d55cffdcbf80287. 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/QZK6H2250416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb7fbcfef25f8f575b275311bfdb00ffc4ad3ab2e01302c9b590b4500a07b46. 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/QZK6H2250417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935f7c432cb5c29a7aeedb3df7a50b3d44f33ef9f01b07350334ef561b3c83bf. 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/QZK6H2250418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f8a8557b7f414b0200bd51acc686fdf38fe1fe0dfb2ed88e99cc52b0d5bd87. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6H2250419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae87a8163d76765108cb35c23f60ce84cdce929b6999708373f1dd8ee22098c. 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/QZNWZ2062786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626c385ad3d9be9769f8d94a99081d056574e98624a876d7eb67ed2dcdd68196. 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/QZK6H2029065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8085148edb355881f9b3f8dae1f64f0bc75580fcdde385632f49bc695f5c419. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6M2434617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4378899ea2ce50163fa651391f32ab8eae295599976d9bb5ee6f0c0bb27cb7d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZK6M2434620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9889488faca0b76843cffb3c1d18ba55db06fd9cef72377e1cd88414b8ac4ac6. 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/QZ5FN2270201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1863de9be4e1da229658c516b3e1524e065d2975caf0c736521e8656e34b7674. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZTB22292796.