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 0xcab935286abb4203d9405394d2892955c42b5f21ad0f5d1e5d82995142e2a559. 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/daeb9507-2f9f-4ddd-a0fd-1c8d729c86a6.json and https://artists.proofprofile.net/proofs/artist/daeb9507-2f9f-4ddd-a0fd-1c8d729c86a6.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 0xa5c1d46adfefd7a144b68841b1925ea5943c2d666dddfaffec39592298cde263. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRV962100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f5b9b139b6539ddf1f2909f5a03e1d648cc140f5942d5f72f0c7e24793e56e. 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/FRV962100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7eaf1a18a0f1913752647f028d5cd79e0139234226a27c8876502db9c81bc6. 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/FRV962100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7056a1518513a42d4dbe40fbbd10e0a8664d50494f18e5d1b36e2fd7cce31fc. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FRV962100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1771aa4dc1cf1f218a193c38891412f8a4cb77d213a2a452060fc6096e973c0. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FRV962100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea8f328eee0c13f1fc87e17aa504a2e0ee8baf21400ed0f511d20e4cfe484bb. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/FRV962100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70dd9ef26933eb2a87b1277d72a9df456a116749730c81592575696e735eb62. 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/FRV962100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8646a5429662c8f62d2b0396c9075141f2f73dae8e95334829012b746706b596. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FRV962100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179aebc5d7d109901e17c67d7d8d990e546d6b757f941815a0c4e10e36024332. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FRV962300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7050869e1fdc6ea487801adbf2a6c90e2cec79c510d9147457d760688b5d4ad. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/FRV962300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb826b0e90370d81f568e2b30db58bf9d4c7bf7a0575e0be2fe158bec27c31de. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FRV962300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc9191be6a85afa97d0381032529b05264bcbfdfee890427b6f03213da8b1a4. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/FRV962300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98697b4177caea3a042ac3c09124b430503b572ba657e5a07ad86e225e09bd27. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR99S2200140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2156c756489988eddbe3f05245a2393b7c9467894685d7d0ab86d3d9aedf2263. 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/FR9W12367599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73a42005c70f0204b6427465fdbc12e43bbb5962fc3bfc2b084131c82a1d580. 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/FR9W12367607.