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 0xd2cc716e82ecd7850870f36cae022645a0df729b640a97356ce43e27180497c6. 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/101b6ff5-6b95-43f3-857f-0d2f9bd5bd59.json and https://artists.proofprofile.net/proofs/artist/101b6ff5-6b95-43f3-857f-0d2f9bd5bd59.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 0xdb7ff57c380c13fb1341b6bd96e2fd28df5aac365ba7b41efdd13d38eba41137. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZDA62372396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138e3602ef38199422c34ba7eeaef81c5cb871193077018a9ee022aed092f76d. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZDA62372399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54392c0efcf96ff973734302f9b4b8285f6818fc4f70cfa832fbee60eb35732. 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/QZK6P2248819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df5146510af4db335ab0cdf921e99a947b8fd0b2dacd9f71448d753d1c32eb5. 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/QZHNB2239206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736359616104a2356c6a846cee5a346e99ab7dac0aa206b37da28ea987aa2f30. 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/QZTB92233501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c869a7d35d3ff9c066762344893909e41f4b50ceb3afb7626b873a2167bc409. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NL9MG2300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa977a8145ef13b0b262b16e477d982c335e8321be0ac3b950b8306f9cb306b2e. 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/ESA092211300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e17bbaa71b72e7c8b49e58f4ec1bba23ab3e8250d7fcaf5cc2fe05bf1cf106. 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/QZPLS2231221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb36c1e182d4943ad1d228f18b2f7aaf924b9a6d22657c5ce72948b2aa0f5e3. 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/QZPLS2231222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ff382973e17ff489303442a97c3213c0374e28a2379477cd2bd4bc06d1f3df. 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/ESA092200213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe217b8b5e523da854963a3bbdf423a3939d1f68cf5a79d2b70ebd644d32cd2eb. 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/ESA092212110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cc942e480eec77816e8289f561e8373549f801da3b07262dda194a49ae2573. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZPLS2231226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a84e498d8f646221da3d19f91b3a3ea649b76dde1a418e3458c854b196892ba. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZPLS2231227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ebdd05adfdd5d80dca5b4c755ef94eeb6cd4d912470410e59f00636e1f29d5. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ESA092213340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f166e321bcd2c592da3108f2b6f6ab20b000c52e3f52398ba3ce0196315aac. 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/QZPLS2231231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f1a7f4d6e94da8e2f0762d8e20eaed134466ffa09fa54ea7b7d4b84d39b0f1. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/ESA092232269.