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 0xc54b6f19d1eb696935d43510297fe1028b632a4ff152b63d6889f0a3d17d766b. 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/5a6642a9-b415-47c5-bffc-cb22a9d90422.json and https://artists.proofprofile.net/proofs/artist/5a6642a9-b415-47c5-bffc-cb22a9d90422.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 0xcfb786774c970109440ffca13aea69f10c1cab4493b97fc8f308edbb95c07ec6. 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/QM4TW2095918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926d7f7d6968e20dc6f28c5868941fc9bebb2f9db3ae977d8e14359a089c178c. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ES64E2466348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebeff9f842d376a29b03f18c5c8b5732a9792dd721138729a99dbcc74a2bf2a7. 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/QM4TW2432300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56534e8f0f7a7cee7e40b64f0abe3ac18ca134353570925a8dca02e4ab89489d. 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/US7VG2431674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685ea5a6ea90f204707f173f4c31031da52b19aef7bbe79bc1a4c21fed1a8d19. 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/ES71G2225099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e907ab70b6d282bb70be54fa74c719b4f6091e5d0c47ee03d968cc10541527. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TX2202141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac901085cf768344278d2c25e45159fe1a94f25a7bd65289ae00f027e9a6ab9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2155137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf8fceb822909ea24834a81bac44e0608e4a706a20523ea475b49379441db0e. 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/ES71G2152422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a1a5138093a62e64ad6cd5bf74967cb30f1eb4a16f0ea9d68f2395a320536c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMFME2102736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1ba801977e8795d35240e455d4e57cf9b439a476ef8553c2e92dcf7e33f461. 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/ES71G2132839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25913e6aec4b98b0ebd0a020367fd10992ca2383269718df67c5f6857ee1b390. 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/QZNWQ2040438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9878bb56ccbe4f791793f2f666fbeca883cc4920ab6e857d9749cef9cb6c9793. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2044604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbbdea36f71e7dcfcb4c8491b078e24d38ceb76019d65591b98a67c6f24bd75. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES71G2023041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74a91ffb1db784dea1921c7ea55440cf557ef5cd6eb86bf8a44225658ecb3de. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2021021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4a46404384a80da82260809b196506264c06c2af499b40559390d1618fe41e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QMDA72128940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1bd43254faee525ce2dbd5a41a7f0a14b57abfa57cf8bf8ff783241ee72b2e. 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/ES71G1937231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5a2c10041a71a8880cc3a23cc9dd452cbe55c3a3d4a8f2a859bf0e8e1ea761. 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/ES71G1931512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4adc8d109584a720eb4160d1444c93828c5a9c34576eab09f350e795f42097e3. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ES71G1946577.