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 0x1b48e2c4cb80bbe76ef21e18c9f39f6b5242611b29364c4a3fc2e6689e57d623. 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/11aff532-4270-4e48-9f5e-c4a966e86598.json and https://artists.proofprofile.net/proofs/artist/11aff532-4270-4e48-9f5e-c4a966e86598.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 0x48710e3e235700bfbdf04b0b868db35d996900891599f3a61cb5f9553b7586d6. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/PLS501600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa9f77a8cd96d0a904dc5c2c2971996c7945f176a3cf32a591fdc7ebe7e9bb9. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/PLS501600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe23d212d4cfbfd56526f58467661069b64d753b3203243e0f6558adf128d08. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/PLS501900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7151e6fcaa2f02e72b4ed67f1aabadd2fa60a2edf98212716d53f1cf4150f9a. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/PLS501900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb714e54b03294133c912fc2d5bfe6758bd2527c7ba585aa89eb5af35592c0a76. 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/PLS501900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f75e0432efcaa1f86875a7bc34a525f105418d18e54aa68778740585d114cbb. 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/PLS501900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8967142edeadd94494041e98185a9b498a4a71b2fdc25a92a502551f4a9a7437. 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/PLS502300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd947ed316ceb13e835aea2d757c728754c4c27c5aede59674348deba86219d. 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/PLS502300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc08e3ca77195aa4716794eee1dad9eaee155fbb5987d635ff6bf76ebe02274. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PLS502300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05dbdfec4511e62a3d605b47b496ddb99b75b46fb09e2fbcc8caf7e9142b01f. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/PLS502400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e59f9b128857b1989eba9a9458a679204ce47be71a95e447a88bab0aaf6256. 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/PLS502400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b1793abf27a4f9cdc475ada1d70f96695e9aaa759117fe55fc65e9c34723d2. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/PLS502500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ccfa7f4f63df92d9cabe6b997783f355cf17cbc14896f015258b08faf36e35. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PL37I2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c27c8b0ef9f38d8c23d5c782a3078a1b3aec2633fa076999803e611dc1df44. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/PL37I2200002.