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 0x54326b2f9c062de0aa5009b9469cd4863f95c07073339c3931171c82b0de6704. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74cf7e6c-e1d1-40df-8ab3-1a83195384fb.json and https://artists.proofprofile.net/proofs/artist/74cf7e6c-e1d1-40df-8ab3-1a83195384fb.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 0xac68b18f5734e532213ea84fcfb9519b67087d6378c9d24f0f848a9c89e3004a. 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/ITG272200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3f4e3c31af0b7c39591c409ba7c98c2ad30abdc78adbd144d83e13e5d160de. 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/ITG272200081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe05b9b7e96a65783715c3b44cf744fdeb92818736025f22f58aaf004cad2079. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ITG272200082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8141b8e0675f5a5aebf39163dfdc27b75acafad9a1928185832907eb4113c1. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ITG272200083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd82177b3fe7e7444a95b83aed1be706d90711b4cd16c4f285921574d027aa98. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ITG272200085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b99bbef8eb82f8b923a2d5fbce2714e82d68fb559ad87c07cde9059c4c91ec0. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ITG272200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa551c3c7543a8335df82bd43381408ce44b9caea15065a4f3019bd2217c2f15f. 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/ITG272200087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ead1662b3e4f3e31bdabad10fd6f3c380e77899a3347c2a0255049307021c4. 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/ITG272200088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545ee5234ca077186d9df53a856308f82adf39b7d86a9e90a8a0adbc8323e678. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ITG272200089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50617434f225ee98b8342a70cdd6ee9b8110528e9123e18b8fff5d0182e63446. 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/ITG272200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7865e1dc3da1a23c5651ac92b095f14cab22d5f6d877fe71e09effb168b99cdf. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ITG272201276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8141b8e0675f5a5aebf39163dfdc27b75acafad9a1928185832907eb4113c1. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/ITG272200083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe05b9b7e96a65783715c3b44cf744fdeb92818736025f22f58aaf004cad2079. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITG272200082.
Gimme! Gimme! Gimme! (A Man After Midnight)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca818150c7ea807c8e2a28a21c17fcc55929d034eb1a09edeb79fa7b7223d5e. 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/ITG272101329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d05dd5e82265551b5de959966cf4114dd688a45c5d8a45c80452ce9a4e75c18. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/ITG272101322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe60851ec0c871afc0c271408b5d5b3cca539142e2f02440a224083dd8218d23. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/ITG272101200.