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 0x2ac464e966884b5dd70e18a869e4877b4440a0b87b5395a25e76b75143e2e020. 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/4d2dc79f-b394-4e61-85e2-43f9f7bb71ab.json and https://artists.proofprofile.net/proofs/artist/4d2dc79f-b394-4e61-85e2-43f9f7bb71ab.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 0x64cec1ddf81cdd4b874fe4761cc9f0bbf3b8c603221bb24430a32af0688c9ff4. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZS672213378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015fa6703dc16d30b593641b4feb3d313773c5ad91053959347ac5c66b70439c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZS642204693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0ff352060ff663cd95baae6b2aaf6fe0a701e90cecaff8d5f9a5459ed24642. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZMHM2295603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d941c4afe5f20e35504acfe952353b8c9196d32aefb04bf9abda7a9092a285. 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/QZS632261521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea4f1b74bee0eb8e509f1be9aae113b17b0f487fc12b0da5857e0ed4f60c4f4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZS632245876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26de5dae46eeab86b2b356af07f99162dc06f28dd6c3e674bd972205e486ac3. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZMHN2279759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeade8e1cd0896750fb0a95bbfa2a93a7ceb82324d5d666c831079c65aeb7d7fa. 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/QZS662273816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23f7bccadd931799be48b45273c525e780517149b6b2201a01be9fe341cc7c2. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZKDK2392841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ddb264a48514976e7f39269351b3fcb65d3643476d43dea67be9df26888f1a1. 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/QZHPJ2242659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52c020dfcfdebb962ab4dc1673a50acb33b975dc8052f3f98227be39ab8e28c. 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/QZHPJ2242655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3073eb36f1d232eadb5e233be4eb1a6b07706d8169c800485143043e2e000db. 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/QZHPJ2242683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171f813ace5b4706be548296568c24fdc0d47e11c189c7f8cd3e7e1c33d4b153. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/QZFP52336833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb252b922ee7927795cef9507f0cf1827ee106f750726fc3623086f101966feb4. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QM8DG2455687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a78319b00576e6d8cd1e7adf672b6932bf25df93671fb95422245863e3392a. 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/QM8DG2463869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1d92c37243dade7c641c8fe131eb50d4905e860f927bdbc944841b3c531d59. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZFP52494700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a5bbadb16115fdf46e6d5d9e82db48082c156de16414568fda83d86cfd0c1a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FXQ692000165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659be8f25a291ae80ff62d1330b84596c91df64aa0116e2fa1eca36c16d48ed7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FXQ692000084.