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 0x9ec50c2b07978b4e3fe549b314ad95aa8f049fc03925ec31a9c689008d6ee525. 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/9205b24a-c3a0-4eb2-9af5-16a1fea97315.json and https://artists.proofprofile.net/proofs/artist/9205b24a-c3a0-4eb2-9af5-16a1fea97315.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 0xf085960ab1e747e9560653724f686defe67c0f80aa48ba2f3cae75019458c60c. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWR2030684.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdf5618f69bbeca0e3cc084d4be84aaedef1646f8fccc92f143f8f0eae08c9a. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZES82161784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3bf9159e5a02b5ee72c7f4ac375944dd70d86c7d5fab50bdf88fe710f8f6bc. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZES82161786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01138cebd70a148661fe2250137fa828f0f4e97a45f953e48be36d8621ede58c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZES82161788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9ce3902051c68d8cdb72186ae036b5a3952522a49b7d2cd8d4a1f92d9146a8. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZES82161794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92210ddf6894545979aeabc45387e9942ffeef71cca3a124adefe3c0587da528. 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/QZNWZ2135915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be227b6df086f69349b54bfc3d2ad79bd4134b277fde275dc2c59cf1f5a2a5e. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/DEAR42169732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395c0eeb5fddf7ba15283de642d095a744ca05c8ea306c39dbe3aaf16f9c9d6a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZRP52312244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1903bfa3f42a00d420a8288cae6bebaac3d4c6c9bfc7041d24505ca6751a7fe. 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/QZTB62377091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7847929ab4afd66d40f20fcd7e25d6b334bad4f1232e8959746d2f9e83e8dc27. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFZ72410153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96828449cc4ba0f87aa55dc3ea10fe8774e280d6dc816db7f6bb9f39e204a333. 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/QZES52447705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c0f9a62dbdfaab2150dc5c922754711761e7926d924a1492f71d291a8708f6. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QT3EX2493266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95abf6105b1b722ed701ce796bfaea2aff81ec5df1a7f806bcec1706060439b6. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6P2524203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc316526dc0bd8d7d5687dc9ff3c3fd1e71300d0a67fc6736cf2aebfabd7201e. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7U2570578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63659492098e3e2c1a4b0660ff90241fa20ed1a48f1934dbffc721532b38e401. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QT3F62502033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2d5974e12738b3ae906b81c96b623bb30a7034f7b66b77b69ab1fef1961c18. 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/DE1JN2356114.