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 0x6ea7aa4e905360a8769bc9d5eeaaff60a302911b0d07e19fe2e36b4a3c0497fa. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0caf3916-8057-43d8-8d00-8929afedcbbf.json and https://artists.proofprofile.net/proofs/artist/0caf3916-8057-43d8-8d00-8929afedcbbf.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 0x2ccdc920e13ff0eb3adcc17af37e4b4f8cf0efe80fff6937b7348830f26627ad. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZPLR2375363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc705c45d28a41e3877cdb370c3f40c73f7b011560d078e08e8a09aacb4bc7a1. 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/QZNWX2365439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0652fe519e7ee2fb77195e55711ad36074b07270777077cda4e9ac129ff0a6df. 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/QZNWX2365442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2db666f88951d090e506083e8aa56411c6febcaa3cb6755a7aaade50455783. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNWX2365443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc517264bad55dad8ee1d8ec45f82804fc3d9d3f0f733ab7e7e817118b659b000. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNWX2365444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a33a90970b31303bfc47d7077b1618d8daf4c0dcd8207ed4ed477c3b9f7ec7b. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QZNWX2365445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93758d453a00f468b96a62a02e15a83b738a2eb30124995dbea37a3ab95541c6. 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/QZNWX2351137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec099a70c469d904aad1b34b166d2b843d840dcb8e075ca354d699d34069740d. 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/QZNWX2351139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd2bbcfa51e3e3aa6b93966212b8e9bfdc17a5c5fab886029c2318ea4e8959d. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZNWX2351146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868ea1bee6daa907a7e2e352bcc662121c0dac13d2fa640539716a36233e2eba. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZNWX2351147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b548f1346c82cee174b4ec56306a0f5b154424ccb53c017706071f984aa52c7. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZWFG2460083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3ea728be55ccb7d7091c43e936ae6e99d7180a4ddfe745e480365c4d54af49. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZWFG2493182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154cf607e3245c90f19769dc954b218abf7362a9dd66101e2e0f3e846d55176d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZWFG2495087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f81f12fd21fd8cfb2a445f4cf87c95d825c18f2e367ee8af5a7365137d2f8e8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFL2465724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdbfc73d924273bd90d43837d3a9de132929ae4c5ab46c90c23428967102acb. 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/QZRP42505704.