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 0xe125cbc7ec86f6ed1da113eb98d4419a2b6a32d27802e9480b10a65f65fa0954. 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/9fc02892-0b96-4eb0-bc3f-fe3066f12e6c.json and https://artists.proofprofile.net/proofs/artist/9fc02892-0b96-4eb0-bc3f-fe3066f12e6c.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 0x17a6fa508ebe8c871138541ea1955fd6f6ad509364cdf804fa94860db94b88e7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6M2331622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c907a1ecb9f4635f221fb0fd8c538730d3fa9a13948c80141e6bec4bfe137e. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/QZMEQ2371428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c907a1ecb9f4635f221fb0fd8c538730d3fa9a13948c80141e6bec4bfe137e. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZMEQ2371428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3335931b0f4a5c002cba41c448ed899a89da9240a94a871c69d73db1e04c4c0b. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZWFL2336803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143fa7eb49346d10094aec67761e1d05a02b9e48ccc325e251a237419efe0c4e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWT2485157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7838d477c41ef830a6d4b24258e9100e4c7933ab140bc7f212b3392c5b011252. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZTBD2480192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfad8b7be755e33c0e912571b4639aa2137421870ac8e06e2db9385d9e689c1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFV2428187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2d841155de54d26606c4fa502d08ad239a93775fdf7a64d14c1ee832aa97ad. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZVEM2589953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7838d477c41ef830a6d4b24258e9100e4c7933ab140bc7f212b3392c5b011252. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZTBD2480192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2d841155de54d26606c4fa502d08ad239a93775fdf7a64d14c1ee832aa97ad. 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/QZVEM2589953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb155db0957a1ddf2d92aa7c0448ebadc467e8b2e98e9e060a2377f944f553d8b. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZPEW2580935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfad8b7be755e33c0e912571b4639aa2137421870ac8e06e2db9385d9e689c1. 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/QZWFV2428187.