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 0x1354cb24ddb71ce61c8f19d7b847a539071a5e141cf31252943985d61fe89fe3. 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/aa31251f-0bef-43ff-b3d2-10abf3b30a05.json and https://artists.proofprofile.net/proofs/artist/aa31251f-0bef-43ff-b3d2-10abf3b30a05.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 0x8fbe52fb99e5e5a7260a26bd2cd86154bd77599ee74e3fd1d65504844d8de29c. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZNJW2465959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eadc02e9ecfa5098d82be4431f1bfe0606c132327dd3d4412ecafb66249a269. 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/QZPLS2401789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2c4105dd3c8b70168454c10d732097a47dc345dbc2dde7eb6f31ec6f95b405. 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/QZPLS2401790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271f55f381f7cd633889ef23a25317fa01a8c13c5a8efc3d14d2ed4559ab56a9. 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/QZPLS2401791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1eb75fc98f6d9eca8981b2a0e5d30bd84f3207e5384e63338ceccf584983408. 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/QZPLS2401792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758bd2366a3acd62f8217e12dd39a57b4d9640522952689848c3e15246a9cc04. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZPLS2401793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1b0261f19520d85e55a38de6f32c9a1b870400c92985e617c1999eb31d048f. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZPLS2401794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323480852be4b9a604841fddab2130a050b74f2b512f84ff5037a06f3dbec56a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZPLS2401795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951a073bad7684f60a09dc5becb153277967d12e7ed8b31bd10f87cc2bbf8359. 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/QZGLS2472509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa082c4113d48bd6ae658e2aa81ad0a735350e95609e5f3fcc1fa3bdfcdf5a939. 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/QZTAW2489709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab2dec0f194d1ecf6f61141195971df5903d807ffe7eccdc110e2c4383ea76c. 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/ESA092406002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed1a0e7ea16efa07c850aa2d16282d9fb60dce9d8d60e61f1a606fb91be876f. 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/ESA092314855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567882d461488f9fa030d0f998fa5a63c78896166605e46f18e5dfe9abda7ea7. 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/QZWFX2416219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e717673daf6d44cb5e4202603d70a752794bfafa6eed839d9ad0ddf34155fd7. 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/QZN882440282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f00cc74a612d19457f701636f3360d5d097c2702c29428209bce1e9ad7ed9a7. 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/ESA092415030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f1a1c5a0b0eb6345c8eaec3177f12d2d7b0a769c779712846d7daa26779a69. 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/ESA092414714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8543d52fa9a5b4820fd7ac3b0fcb6ccfdd2811aed709b079972aa535a80ba5d2. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZZ772401666.