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 0x0c30e804ee69a4760f55063659ede30313a155e730421c3110893b9344b25758. 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/47ae5065-64a6-4e58-b482-85707da5989c.json and https://artists.proofprofile.net/proofs/artist/47ae5065-64a6-4e58-b482-85707da5989c.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 0xd7d7319ceaca3095d5b43352dd91b0da05eb9b040b5c9085789e32f2d50008e9. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTB22502431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a34638e7316bb1492223dd89df40948709f8cb59d2ff8892150608c9973298. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTB22502432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31b5e93b1c569a5d7bb95633dd0e7ff0333740ab009a393bd836ee8eea18ee3. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTB22502440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070b024925f678ebc9b6d270c3679fc046a2ac9271e6732359e9f741189974d5. Chain 2 (Bitcoin): anchored in block 959147 (2026-07-22T15:43:44Z), 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/QZTB22502441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda00f6c54b03422741b2632ee0c5f2f1103f16d70464eeed58bb1f79092545a. 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/QZES52512840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86260db6c1fbddb3acc6ced508b3be08127224f6bc9f44d3de34e43116da1943. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZES52512841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f50c2fe25e8daaf644b0b3a34ff968d5eab827d5b04a444a9843ab74ef4a5c6. 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/QZES52512842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1d71decdd1d326db18e6bd3bfc751d6eee65f00461c964108e78519d639e0d. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZES52512843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf420d4ea82a5a52947a359ef9664b37d4910b82e99e7db7eb20287de82433839. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES52512844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a88748ad9b53bf8371a068a6564e59ae70ec8a71f8d6155d5bc0690f0d359a. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZES52512846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10417fab12024d2086b55846c156748e231a41bb9795af43e9580e4bc487269c. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZES52512847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843525d763173c9c875fec8936eba9fa0cec27a3087bd4a0f4bb2b385613faea. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZES52512848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672305f0ee2f20fa17e1c19408fd66238c0d428f2d3f0b7997495cf8db3d6c44. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZES52512849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb108c3eddc5a21033c5dfa954236373d953893eb49c9fac34995d57c1c37a80. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZES52512851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8652b28619284314f39e11f48723ad38b612ce1c8cba6dda5740b109fc006e7e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES52512852.