Xaira is an XML Aware Indexing and Retrieval Architecture developed at Oxford University, it was funded by the Mellon Foundation between 2005 and 2006. Xaira: an XML Aware Indexing and Retrieval Archi
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497063186aabd027d98196f5854e8d99d13eff02dc77578ffcb5e47ddcde82e1. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e2b0d329-b238-486b-8cb4-2dad1a33abdf.json and https://artists.proofprofile.net/proofs/artist/e2b0d329-b238-486b-8cb4-2dad1a33abdf.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1971bbbe3d74847522745f541bbb0d9e0b79163d49f1b01c9549e9d1dab39c2e. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAIX2465904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7db92cc68d0cf5cfaa99c343a2be3a7558d92d539d4d1ccb9939ba2c8cc29e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAJC2407362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87aab83c079e149ea8dc05ea0326c0b322206f1e60bab276fcee4db688b8c0cf. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T01:45:31Z), 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/TCAJC2443399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6b25a45176500b899c2696d9999a4d22c551cca7499ff0030727ea1b3e56d1. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAJG2517920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c4d3d8b105c2b9620a38d443b43e64a671f3f6e82a3292d85fd869ee3df4e8. 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/TCAJJ2576330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7031d244ea26ad169ed6fa2890c45031f93802f7ecf3efe64cc4ba3b010f8fc7. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAJQ2571518.