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 0x13ff09c7562182c4f7ed46cfe09bfa1cf7b17f173156686fdeeab7be6a798c52. 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/8dc8190d-7eb8-4741-aac9-f27f9811109b.json and https://artists.proofprofile.net/proofs/artist/8dc8190d-7eb8-4741-aac9-f27f9811109b.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 0x18712dfb7913b0a0c3c4ac6650e5340ac1e7a757371e6f85919f4619a8fc312d. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USA2B1603928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797ca39d4c18fd45b431f5dce313aa9fb30ab2da98c41eec4da7a42419e245df. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA2B1603929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe330706a3a0978249642c983595174802ce0362dbbd5fbf3742378e96a015b00. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USA2B1603930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2668262048fdd24890ed8c0f69f742772b7da458810b2fc5002bc677781f64c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USA2B1603931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938fecd11a759894d3734f72da4a3e991ab336fc980e1f7a73c8dd0190644ef1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA2B1603932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5f51430e12b7c61ae47fde4972b394ccc5cacfb558b7095381aaaebb55efaf. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/USA2B1603933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2786d259ac10b12c7eb9f72b66e2c879e80595a58fc0e52e92f8fcfa7e0360ca. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USA2B1603934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d635e73d5cd97bc433402ec7565139204d11e95888fa13c494376bf6b9c10f. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USA2B1603935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1055e3fbd7f45849ec573e31c9484e3112ba66dde44454cbba0473842fc8f65e. 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/USA2B1603936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13be389b379bd29958d426ee4115069655c85781b85e94d558ea62cafbe196a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USA2B1603937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7dc3f2bef93e279ec64ac28da94af11bcc1fc74c6ecde75fd2f2ce4050552f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/USA2B1603939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947d5d4f9bc97ece3a6745668cb3b424e8e0503cabe52d20942e42f195b04c0c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USA2B1603941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdad518e899a632ed4cac1f8ae423c4c84bb1b41e4e7b1eb0202339bb10883d2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USA2B1603943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404befe78f04a788aaa4e5f2df1ed8f60b4f67e5e5ff821621cb931638463d78. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/USA231603928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8215668de090979769f1f4354542a767baeaaa15015e2195b0b4b65c12419d5a. 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/USA231603930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a643efe88949e9e89489958853239d034a388c2bb49e7c0b1ae6d9ed7b47cf. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USA231603931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f051714abae6ee3e9d1e2125ca31d2762851dbae6eed55f339c13e1be76af2. 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/USA231603936.