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 0xddadb7f1fb15ec43b4bc40bc0ca4ebeda69836e8866ee64f6fc093bb1dd1ae16. 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/49c01174-efdd-402b-ac1c-96e2f7b30d65.json and https://artists.proofprofile.net/proofs/artist/49c01174-efdd-402b-ac1c-96e2f7b30d65.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 0x649b48b644439db7a8515ab04f37dabeccb182a40aee8dff58b77859ecfb7a4c. 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/BREMI0000370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6c65a1d74477f4ab432067ef801e3c499523371f2ce69a2777742015aca690. 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/BREMI0000369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc5a5efded51775055c4f44c47b316ac96aead6681a8067f175ca5311e92486. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BREMI0200049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192499eee6f2dbb3af920381940e40739d7c6635beb08d296446480cdd945366. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BREMI0200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4703077539b0bbc3cfdcc34100e0fd89ac2d3e58b067dd2b884022b428131aa5. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/BREMI0200055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0575c76b7643d7041e52eaa91b69696f074a7ce23363a6d7307eac9ba3df014d. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZHZ31995236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd44f83577f8049430b05ee314b23007d041bf266e70a66b819c559007163fc2. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZHZ31995237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32db20f7065663c28e25d54427751ea8b218cc6d339c3dba2fc3c01ee66fba59. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZHZ31995238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8b2d6e0bf2ab90f8648e55314f76edb7e7d4c2b3726be70b5e04037ae93da7. 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/QZHZ31995239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a947273b6ae94fe4457909cf17a73b08fa52d10becd7b1d2ad741e744b2acdd. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZHZ31995241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d51bb5e974e74013b080fcbc433a98dd522ab4bd4b461b130f111b33f149ce. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BRUYL1300078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cde43330949af1ae1448004dd1b4dc4cc78aff8f4b8f1d5ba8567eb6b81e161. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BREMI0000340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cde43330949af1ae1448004dd1b4dc4cc78aff8f4b8f1d5ba8567eb6b81e161. 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/BREMI0000340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cde43330949af1ae1448004dd1b4dc4cc78aff8f4b8f1d5ba8567eb6b81e161. 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/BREMI0000340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cde43330949af1ae1448004dd1b4dc4cc78aff8f4b8f1d5ba8567eb6b81e161. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BREMI0000340.