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 0xc366e12e5493f66d1c45cf6129bae36c9eb2b89f3fa2a51a0e63f83272345eec. 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/1db90d52-d20d-47ad-9fff-cdf11dd72c48.json and https://artists.proofprofile.net/proofs/artist/1db90d52-d20d-47ad-9fff-cdf11dd72c48.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 0xdc04282d76728eec24818ec82125b6ce9b842cf4657609bcaf518f5783cb303b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN72574999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00bf7246496247ef9c98e1031dd967a924dea4eb7aaf26faf6dfa311ab6ad62. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN72575000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf754c02964192a5090c0b6ae24247cb2942f58fb0277767ee36553916109968e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN72575001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4cf064d93d96db4da75f9ee55b2082fe719153bc315f4aacb2f2272cbd06cd. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZHN72575002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4890d3619698de95a1e2ca6301e94a3ebe628713319e37294a5fb39fd7bed1a. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZHN72575003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1d1b0188745c1b6c2dcd6f7e6f85927cc88d7763828fb1de3dda7267d8df17. 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/QZWFN2451420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e38becd4d031ec6798e156cfe1cc178c32fd59fa3f79ca9a06b91731a10dee. 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/QZWFP2487074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda1c1ad73838226dea98ad55a9411d85a7b74ec53695a37054b45c68f6f7d3a. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QZHN62586098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4380572f9228511d7f927ecffa60e4668d61cd0abf9017d6a86bbee04585a97. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZZ7N2460126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80226518650accf2b4f18e783cdc9f065947062b033e15381ea6a41c0f1543aa. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZK6J2555494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8193d9c75c091052c12334716a0ca03240e9fd41a44a382a7456382cfe7a63dd. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZMEN2567192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ebac210394cd77baffb89eae02d0bb1888e78f03da6949c4a9e19227a62668. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNWT2565530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970ee1632d5e3d2e3251ca3ace4ed0d97921a483970860a2a2c1695806f612c4. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFP2571225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97709d9760602ac096419bd9fa988b6dc2a7c4e1f10da3f1f8fb366f9d2248c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZZ7U2559004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5b7039bed146b3a8d5be38c1b1483c018eff4ac80f03044a948ebf21aeee50. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT3FH2535612.