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 0x784dbf7b7ab36050215cb38f14020e5dd674358db4f605e05a415e55b4bbc827. 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/db790587-f8b6-41ad-a81a-61d826cf810b.json and https://artists.proofprofile.net/proofs/artist/db790587-f8b6-41ad-a81a-61d826cf810b.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 0x738b11818203e1496f85ae45e52a7be1a6af149fcd03914b461b84fee6306e8e. 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/QZES82033742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d52574eb804c4b11884eda7845dad0802ca8f36adf4aa6e5d75401a7566ee2. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZES82033751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeedf88f543af888971d23b5a9cd99c098f37ac5992b02179c6be07bdc3d3632. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES82033752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50c2667fec50e7e22abc8807404c7bb57030b871e22b207201fb2ce1342eff1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES82033753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf28eea30d31228262f5e0cbe62904fe1bf2048527cabd15f47cf7b8be0a1324. 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/QZES82033763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203f36610d5c70a8f331b7e2dc2f58c8b2e17e9c0475b0a97dd5cbfdda06cacf. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZES82033764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14fc3af8ec64ee72b7d9d43611bbf4e4aa215735aa4f394d21f6a704c7c0869. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZES82034204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cc80bee80dbe734c447e34677c92ac01bfda98aa9a79ec10bf0debbcf4ebd8. 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/QZES82034206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b20eff608e6640ec6462668d038d51c353a439a9d4b6437ded7d2c24c0073ab. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZHN32000982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22af11739f0416f028cecf382ab1593958545f142e7703e301c0fde565303bf0. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZHN62048778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1c7ad00e9100cfddab79999f1ae4bd3839d93d2523a723d8bd444e0eb96da5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN92055402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f996bda3d0326cee02be1b46b49aeada3097b869ef69eb3897ea71f64f398f2. 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/QZNWY2182461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa39d8efcda4d5ba2f56efbf25b8c8df0950b033ade66e2793410df5493588f1. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTAU2300364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b5365ddb733a8fb96cd9ac6ef636c328dd66a3b2a336ebf52b748d65e59c5a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZNWT2487779.