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 0xa85e98016a033b023e3edb2a851794125a1c0229cc0d2c3d881a8a2ff8cd48f5. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4aef44f7-b766-44f3-a797-3ce2db59e204.json and https://artists.proofprofile.net/proofs/artist/4aef44f7-b766-44f3-a797-3ce2db59e204.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 0xe591cdfb48c157c47171a37148982255ceeff6c36d47db7025a2f16f473f3baf. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:26:26Z), 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/BXF2I1800148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64d3bc2c413ed3fa75b859605ea376e0b5b92563ca0f13f39a96f36b5a607dc. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/BXF2I1800151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fdeee1d0817664ade39f43542d262b17d66f7cef00261617f935df525014d4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEH742415666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87cce240c72e30693a839aec6a045184b649f5b49828df8073b1b0e5ecec0b33. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEH742409271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3057474e9202e6434ceb8f5f805ccc5b5c58ca18619b5e351b96a9b4276a82cf. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:29:47Z), 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/QZG2X2419424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0541db11789e18481f76c84fffcc9af8e855b3ba08901574f4ccb16be0146ee. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T14:07:51Z), 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/QZG2X2419425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bf82aa5c84f9b69722d876b0ed954c32fccab371ae6d6993f690bf7f202278. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZG2X2419427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07fd6c0cb3a9afa7e6d6fbafd6b66a9cc03f622c6458ff9e9746b074b3cbd6be. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:49:35Z), 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/QZG2X2421986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b17da0fb2e9ff0d81ef2647e019ca2365f19d850916ed18b84e0c3a8f1746c0. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:35:18Z), 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/QZG2X2421987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0802e343cecf7ab5a77ead93b31c6f7c96b112a9916fd8d4c01640258201f65c. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/BCG6Y2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a516e3cf1fd91908d0db281726b41335337a9d233559ac43211ecd0f82c753. 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/QZTRX2406405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478805c9087411a7b17d6cb7168b24f1d34205d926d4da3b4b2385f09d0f636f. 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/QZTRX2406421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba654668e7001539b5ab2c38fdf3ca2b78eaa20e2bc8d3fee1f7616bce657fe. 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/QZZEC2436947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494c534ea4a43b84c855a0364922f4cdee9c602d36adac237e17e7e1e447f63a. 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/BXTJO2200031.