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 0x9a439be27f4b01fda387594bce567eb66bac8f9df3571f88504af1dc28bb063b. 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/6593d918-2b7f-4f37-bcca-76bb029e83e7.json and https://artists.proofprofile.net/proofs/artist/6593d918-2b7f-4f37-bcca-76bb029e83e7.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 0xe79b5ac332412e4fdf2935836f7069affc36c85098e8ce6eba72eec60f116f83. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/US3DF2421338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa791ffcc4cfecd46678bc22797d5e1bfdb0482b03a08473b3a046eccfdb98ea. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QM4TX2435802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514cafbcecbbdce695359458aaa448e3442e288af19a3fea2fbfb70db9321df1. 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/US3DF2446375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46db953e6fcd6c83887f43db50d026d3a08d989927d20ec65c754b7373888ccb. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/US3DF2487481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552672a4693320e22aae80b020ac092a1e995251bdfce17b7ac2f7565f1f356c. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QM7282416957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51cc4dba75a0700b5a59e0dd1d68379450320826ccd1b84e0f77b33ab7f0a75. 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/USANG2424525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0ade68e7a46e71a19f975c39c0dc5bd4ef100911275ddc7ad0c07660d75c66. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/USANG2424526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f58a4db1b6cb4e44258336b5011e9acfd72008e22b82457e57e1c233872254. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/USANG2433289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e92dfdb43293b2bd36e403e786855dc4c3069ec19314aba98dc992cf5d88b16. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/CA5KR2491204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf2d18a46a88eaf320efb16cca733264ac49a925c416d31c250041f5f11ec84. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USANG2448819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541ea232da1e1d4e8dfa22bbc3bc9c979787183c7afc93f1af86de5785ba3ff8. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USANG2463274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39384f9ae0bff83d6e69137941341086de2bc3ed466e3779dfd68f21f29dc6c6. 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/USANG2472547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7011b8947f81d60b42940656f118a0320c20a5d421cb478ce0b3b7a44d98df0e. 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/QM4TX2453731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe868c42ed29fd259220d5d3eae4a0c2014f60ef46919c629537959c1444fa5d. 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/QM4TX2453732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf0eec8375afc8e1738dbbeec83a8e8a7661f7ff2db7b316cfca6cf3ac65081. 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/QM4TX2453733.