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 0x29d41492c299ffeb7a47e8d55d57f9e9023ddfb8bdb0e4890351b9d0d01c6e57. 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/81d7e8e2-574b-483e-afa6-15ccbae5f2e2.json and https://artists.proofprofile.net/proofs/artist/81d7e8e2-574b-483e-afa6-15ccbae5f2e2.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 0xcf51b6921f2e709813b475dab726cbbe65c240128387e34471f0cba3c4c222ed. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLS761000138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf51b6921f2e709813b475dab726cbbe65c240128387e34471f0cba3c4c222ed. 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/NLS761000138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012624c679e65bd067fde3f07888fb3b7694a183311347dcd2dc09353892bf3b. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-20T00:15:23Z), 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/NLS761000162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6851dded893a6bcce06f27a1a1e83f3231b57578c039502334b61572369df52f. 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/NLC050800140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590553538185cd3a287dec7f142c64001e0cf812ca2f9610e81f1c4bd64534c3. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NLQS91200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012755148499ceecae0ef6c0f8383ac564f4ecc1eb8bf06b330fedf59bd2d063. 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/NLE801400178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf51ccc9ca55f0573a63171eebe4a119a4cccdfddfd246df029ea4928d58c0f7. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T11:06:20Z), 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/NLE801500112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12a36c88fdc874e7720d743e5c2b4ae71630c0619855b2e44d781f53903a348. 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/NLE801700429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb804b62db0c287d7682d7948fd3f2d72b27b8633ce3f3bf23b20f7aef2d895c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NLE801800242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc73fadcd3dd3d55e4cb00cee5a83796f353c212163fb22f6a73d8a4a7af2dcc. 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/NLE801900079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a4a92c211e97267b2668d40a8ca3d60cca8830496fcdbc181ce4fe187d1fa6. 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/NLE801700098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef676b0cdd13ceb711e49a6340fde736424012530fe81bb0f496dab63b339540. 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/NLS760600357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01638625a86ff26cde930a9c1bb446185bf33c65752c27cd91958d4a2bdb26a4. 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/NLE801900624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6414d4c535cf115883c64bd16933bc4311e7f78764f7d0b134d5562ff32d4a8. 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/NLFL71800713.