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 0x7cb1827e5c648745eb2ee8efcffa81719a8336ec11c4b05715c197c9a08b93b4. 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/16fb4736-23e2-47dc-afd2-ed64f38c9254.json and https://artists.proofprofile.net/proofs/artist/16fb4736-23e2-47dc-afd2-ed64f38c9254.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 0xa5b6c4adadff0243e9377251426fa895fdfe447a40d2ff3fc4b969cf471e17fd. 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/GBLFP2301030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39c2483dd9e6bfecf8c279a45f4b7eec962be102e033cb7dd658b9a9c191581. 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/DGA082470526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8c369f3c23b8dfb0dbea2173bfcda73423dffa61f662cceab06f279fad9880. 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/USCGH2434190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc368419a2f5874441577df81d569893ada630ef1a4457f49d6533bcb782cd014. 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/USL4R2201659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827c8682c622f068620ac174d1607a68260440632bb22377af7860648ecf8a38. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:49:06Z), 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/USL4R2256523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629ee7e9f376e4100470f2179c0e1e09006bacd414f74458337790668ed46be2. 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/DGA052288182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa2a850b0e1be07b55b39b80963a6c596a6be96f4514402a48ebe156b76ae3a. 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/UKW3Z2201660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53af24b494ea9fc5ea47937616948ceba49ea77a1aaae17a697c5c44895e5648. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKW3Z2201661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758224a74075ef267a41960d1426c33c16796f815fbe86b15a55349215afe38c. 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/GBLFP2204451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb5fe3627d875845f8b6b55e92f34a677c2a010525cfacecec49514b28701f1. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/GX53U2065960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62a523d16dc3489af55f1d4965c253dd7dbd6dbb0aba54d6df6180fd7089de4. 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/GBBSP2150016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01fbea226e54fce53ebf4c1b1889728fc21edf4b49cd50c655d9547425360307. 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/UKXN22146643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fa6b949fbc8ccabe7450e24855938dbc9412fb05bd1272cda11f76a0bdfa01. 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/UKW3Z2000509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d1a44fe15fb071496a2eb74f75ed158bc350f753396799110171aae9e491a7. 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/GB76B2003901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ac93bc18ca67e73a86cf85b0bf9f8db28e6b8879c10f2915bcbb4a5b5f5141. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZNWV2188908.