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 0x3a1df1826b89593f00f0c5583b92ac0cfae22649c347faf5905d333743238ef8. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c70ac410-cda5-4c1c-be05-be67e9dc562a.json and https://artists.proofprofile.net/proofs/artist/c70ac410-cda5-4c1c-be05-be67e9dc562a.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 0xaff01798ae128ea320f24715c655c181b92a2f2c3cedf228e190925e2cab9ff0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMCE71302869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeae99d6014fb3b2783a1a750cdbbde1e5d664f04d9803aef6c848b4e2cadae9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMCE71302870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c18939f212f1a6e73ca34112f286af1b7a037f297c962cf477a013785f8c88. 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/QMCE71302882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498afff03fe21e3bd062fcf4eeee09d1321bc2d86276ef3be6e1f5fa6d7ba0d1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMCE71302883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd597b07097d5385dc65f4a4bc3156558b12027fb94391da54dd7b822fbe3bca6. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QMCE71302884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d0ff534adfd1544e2c578464c2437e875f8ab033a397c52434bf494bb93330. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QMCE71302885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82b089bb448d4d5e881a7e64e2475e7963b97a53d05b6a4ee4e34b0abf595d3. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QMCE71302886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabea93ec41da8dd7f9a1a68f46af9d4f076cd2cc5328f68dbe0d918ff86dcefd. 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/QMCE71302887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc72bacefc3067cfd7649a2fa79cec53d8ed8466a8bca7ebca6115649396850b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMCE71302888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x416fbbfdfa9fa67c0242a0d4cb68712938a7e66d44f269210d7dadcfa58eb296. 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/QMCE71301894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abbcbc81c022fb63b96bb5e088e41dfc21b69156ae6cecdcd91327339fdbae8. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QMCE71301895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb067010063cc71589c31ce9fa1cf20576fd42a3a5bf00cf9a6ee4b810a846e5c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QMCE71301896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419750a698c390d12c7df339e57b1e86f756fa0fc42377af7066df6a1ed77641. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QMCE71301897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f47ed716975995d8821e03b6b2dbcd56a41655eeceabf779319f2cdd445b274. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QMCE71301898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ea7d671fa14f1a32b2f6b277e356b5f6e9861c4d99df6ad7bb92de5a6f8bbb. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QMCE71301899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c9bba293ba0358fae74dd3df10b0f1aa88a3b1623987bc1ec96877d05bfec5. 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/QMCE71301900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa242d4cf26935a0589cd6b752d9ca08c67401aa8f0e13a473d553e7764f813e. 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/USQY51700445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeade145aa8ec1638e7edba89fedac162a44e8458f0a4401eeb6afdaae75fd2f7. 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/USQY51700449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec75a3e126aeded1ab2382c3f7678aa43da3ec907448d343c18851252d42235. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USQY51700448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a4d2d872fbb3d2cf0321d59636b56da9941e0a08c68652a7c35a80a4e9b370. 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/USQY51700447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7c21ae043504f0fbe2522ce85895d70895da62a54b7a5df984b4bb1d1afbd4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USQY51700446.