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 0x36cf734af7c7a58e5b2f98acca20741dcfa47f56ce1488e808f6a9b0123d7a4d. 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/e3ee2b00-fcc0-4b4d-8986-89c517ccf480.json and https://artists.proofprofile.net/proofs/artist/e3ee2b00-fcc0-4b4d-8986-89c517ccf480.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 0xc2bb00787f0d4817edb49de7656e0b56792bb4da91657a83889818e8ad2b4f38. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USDY42252238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137a2ed51f58d0db757c789624d825cbc23111184029dc9b6016e58c92aea1d6. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USDY42252242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601bce22bb101fe9477d2f1eb5403e2fd51299f0f1c352b89e49d4f986422044. Chain 2 (Bitcoin): anchored in block 957613 (2026-07-11T21:37:58Z), 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/USDY42252243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb2ffda8441d22cd5b4ebde1ea2fe830649eeb6ece7e8c271e4a37a34d0df89. 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/USDY42252245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd444c70f6e34cc5d0b34133caa3748737bfbdfff4ca1f027078596b322c8f8. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USDY42252246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0730481449a736cda9d6cc0630defea78a545c251d9eb1512dbce1048c35f23f. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/USDY42252247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023447c2d91cf8bb0596f0fa8662b7120d2ccc0324ac94772815a6f5397f4bf8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USCGJ2318311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcea9c57cf43037f5909fd83554be8ca11b55b497f7fd9d2487a22d7f9252556. 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/USL4R2372845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d70a33ba8bb189e34aaa82a2da3b25d6bbcc9631583a104e4e7a19d8181c086. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USL4R2372846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c0041e6426d3235f1e2b47aef745dde5141e987a9eb1d2f74b0183cb2db500. 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/USY282324444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40acd8ebad5dc01ee55cb1ec5fb96760e2b11f2509ec7e9459a0186cd54f57a. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/USL4Q2432679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa406c13c27c2ad448e374365f385573f7f59b458edfacb661773a87ba37ab32d. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USCGJ2561513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd4714cdc5241ca58facd8ff117bedbf887d61794b5ee83691d61d6e3c40cfa. 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/USCGJ2561515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172ee1b52552ace85c5e55e40e5be4c1debbfafb1add0d9c3459c5a86b58e3e8. 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/USCGJ2561516.