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 0xcb082206a83245f480709d1bc57e3f1dbcff22cb8412db4150073fc7fe9ca225. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3161ca82-f5cc-4fdb-887e-5e51776271ae.json and https://artists.proofprofile.net/proofs/artist/3161ca82-f5cc-4fdb-887e-5e51776271ae.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 0x185a45829b7b090b9b97147a1d9d65ac838ef9496e85a26b27b1b702748fc23d. 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/NLL6T1900312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4263aea5e2defb9d0a162907797b7666d2b34d893b2b6093d0f4cb28323af0. 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/NLL6T1900313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab69817853fc520eeaa9584c4ea95d7e8c5191f7b8ac421b104241aaf3aeae8. 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/NLL6T1900314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9843b82d553993b8ce580401de68140ce6f479d77f757f355abc611bab0954aa. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLL6T1900315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3ea99aa5ccf33aa56b748a829e7490d1cec83d251963db087bf267ace7a455. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLL6T1900316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b961872322d2023deb14c9801873118b33943386c5ba005da28ddc5206f65ea. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLL6T1900317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282a9798887f0aa8e07ba276ae861232c8f4628a0fc667a3c1fb4de3ae11791a. 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/NLL6T1900318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406c8b2900650488826838c126ed553deec99dbca3134c3b23b26304634ae4b8. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLL6T1900319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4f19ed400554929ac877ecdb54682e2cfb94bbebd36adf50b22aa995070938. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLL6T1900320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56aeba0726b2b19403a23132e40f233dfc6ffdaf91ce18ceeb0f5d487c70f7dd. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/NLL6T1900321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb69a03aa270b9ebacd68614d870d0b0a977866c8f8c1bdf28c6dc1191031b06. 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/NLL6T1900322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56aeba0726b2b19403a23132e40f233dfc6ffdaf91ce18ceeb0f5d487c70f7dd. 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/NLL6T1900321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4263aea5e2defb9d0a162907797b7666d2b34d893b2b6093d0f4cb28323af0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLL6T1900313.