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 0x63408305e6709569047288315840fd01ba992892d90271e3c96ad70531e792b3. 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/e3c88335-c8cd-4bd8-8fcc-ebe0808d03dd.json and https://artists.proofprofile.net/proofs/artist/e3c88335-c8cd-4bd8-8fcc-ebe0808d03dd.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 0x724b50aad52f2533d999044127a9b466e9350c5521daf2c9479b1e30b50536bd. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZS672196324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ae58c37f140b42988c853972e0231867588cad605a5c1412cb79e37a4d57f3. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM42K2267961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ee1f79de86430fa845f5a1bcf8a3cb9e95911fa9072046c190e44601cc4998. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QM4TX2284319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee13c64071db8725db5513d8778fb09fc2c5ce3b1fa86bd2b5fd8c8af0e812eb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZH5E2288698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be6f014bcfe5cf0868f7bc6a4ea2c670d304fad63de9bb61ff9b48552e401e4. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QM4TW2336211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6303659d7576047ff3b663deaefcda1f553824e2e02c35b2c97dac8cbfee78f2. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QM7282361773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8e265e129cdf78d1168875bb5dcecd8b0c5e9a1ea72c567909024c9d4fe635. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QMDA62342249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7cb0a4e7cebff68cb74ecaa0b8bfc34a8bfe0ea2ac0c5f727cca19d1ff81eae. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QM6MZ2408719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb54d5d1038c92e69db4cc288841ac73ae8aab98d1d9dc8e71ee7392756d195. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UKZGC2407045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33cfd8d7f779a451b6d5de4b44475a8bbc8cb360d589f5ae50d5a2054293d78. 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/QMDA72437163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9754734fe80c339d86d07e75a4e5bb063544be047dc31d508764ed7ff9c856c0. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QMFME2404914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4df25d0e4e74b21315cb60af1e9703c1e6d435f9478cc535e56748a59d010c1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QM4TX2580796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c9488aac9341f67f283c187075ff20ada63637d5fd0eefe775fb1d9a770e7b. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QM4TX2580797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5269ed4f7c21eb5acbd1d1f10f2955c38d6305d2e2fcc77b86548ccca427e2. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QM4TX2580798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a5162c666b858f1bc295e97a169893c3736de3a4c66262cb93cc9bb928df43. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QM4TX2580799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9912b0dc5f7b2dd2d3169e7e149912169412bf113e31b264570c5b3abc0010cf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM4TX2580802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8379e9516d5ab5b6a3b750078bac6f44ec5593f619212e01907c5b9354823b. 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/QZDA62224520.