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 0xb8900a835aec659f3a51996cc85494feb12e1e8804d821278aa7957d3491c3bf. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6e0ab41-69d4-4e0e-b6b3-3cd09eea30ba.json and https://artists.proofprofile.net/proofs/artist/e6e0ab41-69d4-4e0e-b6b3-3cd09eea30ba.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 0xa653e7afb158102028683affae2c25f7d60b7ec5f86a6c63ac8147750b2e64af. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZWFJ2372502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b549835ae50bd9a58cf6b57cb57cc81dab9b67a83571903733216fbe56a6b8. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZWFJ2372503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cbab342f40cc285faa2632af56794591e4cac33059f4f0c3c27febb0b3a788f. 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/QZWFJ2372507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4658f923f17d899d54db0b2844897efaa6a4f62c17a57baa66d6413b1025b15. 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/QZWFJ2372508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655062dce6c376fba0bf7f71ee8f02776753785a8e4444dfea290ff8f6e3087b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWFJ2372509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bd7ea31185ee3944c5f0b1e980e8fcc7291ba16559d20d83ae7b1fe800fed8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFJ2372510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3f5e9bcf24813bb458799c421f96e15433fff2262f19ae57aaeac72e5cb55b. 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/QZWFJ2372511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8130eb8410a0ef1ea562ef9b3a31f18da2f325dfec9ddaa769d685fbc0a5d017. 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/QZK6K2471965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e0ba984126940ae5359b7c4ffb4b84d987487aab5a38a074cffee2e9d63039. 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/QZZ7T2485253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5662449a2910a942bb5da432335b4c533709bd25bc0e9d133ab66b4e661d88bd. 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/QZZ7T2485254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e91da1af2e2374cca6fdfc9b9cda21d0d321d2c82a84523647c1a76eb2c49d. 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/QZZ7T2485255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bbdd86db374dd09b268231da5686c6ef8665ffb2cc9f8aee88ed623a002745e. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZZ7T2485256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc953ba5fcc1895e4b0e7b9ebe122288eadcaba6977fb26ed83b1a9710a566f48. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZZ7T2485257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8849d1db4e646e06ac8da16c8f5f6b5e52f643707f48525fac1bd05b76bdaf37. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZZ7T2485258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d1e631b8725eaec1cd07e57e47a5275492318dcd2cbd7786b7ecd7b7c72036. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZZ7T2485259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66803548fbff92a5c354fcc2775bf517d8adaeacf6ce0ceaee9a307627de16e7. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZZ7T2485260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4837b382e840460cc9711259fbdfa38ff99fb0c319d35a49ed6c2e67e8999556. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZZ7T2485261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ff84e10fb85c3970e2752ba17a9d0c25e1686fe0929781d6edf9b3393c6cf8. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZZ7T2485262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fbedeaa060ba2c03491d3e958514c3ce557d1e95d4da958a697da4ff43b520. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZZ7T2485263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1994f3e43fa37e80ec4375c6de50d880e0ac340ee195378c939dc43e4b01ac6c. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ7T2485264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0806f904c30056590a323403cc3a15790f8ee1e80dd213a5564897b919b38a2. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZZ7T2485265.