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 0x2cbf555c846b0963c972599fc7e5270bac5c6b5c6b30a860a5b0e5742afab3cb. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18ab1d10-7baf-4917-b951-2c40f239a43c.json and https://artists.proofprofile.net/proofs/artist/18ab1d10-7baf-4917-b951-2c40f239a43c.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 0xc2d125c7d90fd0b3601e90d439ba968c5e80d88b69a7714a0bd19725e03ef363. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GB8KE2328875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8901d25a6b4cfd7cc2aab264304acb7f0b8b8b3a79c7d8bc89d1c89d04b8021d. 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/GB8KE2310587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba7e9ef6d9756e779460210b7f5d7100f25d50dab0707bdf692c0b4ae1dcfa8. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/GB3ZM2200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3879cb2e75d97d1c61909423421db1395667a0331571e258a4828f046460bf28. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKQU2245019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4485a278a71cfc494d6a0ef603b8f61dddce3cf7d993a3ffa935efcfa48f21. 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/GBKQU2245021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c79fd9be81f79ae88d11e8ed10b9c589c834fd12b4e28d3560826e87d40e9d. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GB9Q62000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a22b9c895827e47e2785ddb42682d71f2aecb9ed1995a93a17b09fdd791882. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/GB9Q62000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd4fb67013acc7c4c93ba41a7d740d711137399e98105530abe6aebf292439b. 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/GB8KE2164103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0e065fbbed66f98004a840dbc4cffce4ca95ee7b8f558ea1be28229bbbf62e. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GB3ZM2200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812e54ea8989624eb41d6369c1c785a7dd45209d4c07813b18063c4fcea69d4d. 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/GB3ZM2200059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d3df8bf085a4e1d4de363af8aefa3cea9464e815eaa33071e2898b9a7951d5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GB8KE2328871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e1f222958bc8dbc60334c1e1294984ae8b0bb282b0a7b52227441470668765. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CA5KR1941181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc60599826a22a9930a9c379768b6328e8cf77970f2de87e6f610920997d8a9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GB8KE1953718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1952b2fbf1e163f1f42accac2514e8e4e4172ac402c045d92e6db482cf06468. 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/QMEZE1763286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e136917de521a58725ef5896c73c4269732ea61f173e0a6bd1fbc59993e12a. 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/QZFYZ2073527.