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 0x718679c43111608c476c847c91edbb2ff501f828ef0a5bf04ab92c3a0c303e87. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca5d58e9-448f-4359-829a-a6d0a1c8a690.json and https://artists.proofprofile.net/proofs/artist/ca5d58e9-448f-4359-829a-a6d0a1c8a690.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 0x8b585d02fe97b2b802b45fbb32b848a0e9ad51b2b010a1fd0a571e6b4ad1cfcf. 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/QZTLA2423248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4845c58c9a96617bd5ece48fcb8b3fec52be1002f5d82b83378d74c9b1b6e17b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNJX2489808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fb7b67ec6baaa82135158e83b5ff7140db695b95dad6167a3b8a6802ab0b4e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNJV2405001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68fa4736c290d14a8ebbe1dbfe6d3ca6848937cbdfe30a7aaa0f83435f28432. 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/QZS7J2369167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b841fa36be2d769db843173f1448aca333d0a2ae8e0434283c292c8038ea5f0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZW9L2306326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce18cdd82bf2999dd7513042a73860658193e25a9a0aa508ba57e3691705e59a. 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/USA2P2252853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500e0a76b141a818a1ecd02dab28b14184e5341b0d6975f50ea6f560f777f624. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USL4Q2131983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d03623893ac1ab14d967333719c61c6a3a9b68b7b55ab1d3ebf7dd6474e415d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM22143385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6dc4ca082cc39e3115ce309d4f01580f925d9b018ccd1c55e6ef84300f7667. 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/QZS7J2355117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e44527b10ff20bfc630e90fef1097f81533b4f0caddc472807171572d06053. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZS7J2311065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0451485ec2f7c481d3f46ab96be6ce4dd3d7ca319295177d51253db4fcf9e6c5. 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/QZQAY2301532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dffadc9807b4c8d230b1ec3ae42b468768542a6325f57c9e4b3b58096ae32e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS7J2377866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d47d58b0e69e281787fe95c128093c84b1125fabf96cf2acd99fad704d6177. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZS7J2346751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e043eb5ca9d7e71c1aaf0a6008b5cdb66004b0adf2af7a132c955ef14b516e. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZQAY2307515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf46c2deadece6ad0cd82940c4a402b46be9bec0ae42dd6e2a4aa409aebf3ad. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZS7J2372261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b97769e6f08f66ef072d8be05a7e42484055d2aa6c168421dbcb8423b743049. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZS7J2327950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b50ce5071764991e1e0a50099c06107bf57966ef0cd35677778a0cae96aa086. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZTL92333104.