LDM, Ldm or LdM may stand for: Businesses and organisations Laguna del Maule (LdM), is a lake located in the Andes of Central Chile Lorenzo de' Medici School (LdM), a private institution of highe
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 0x5505539ed817d43f7a1eb5d7e4d5ec8d4b4c83babca363eb5dd52c1aae702696. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7319ef5-7134-469f-8e19-f374f8a5c1ff.json and https://artists.proofprofile.net/proofs/artist/d7319ef5-7134-469f-8e19-f374f8a5c1ff.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 0x4052cc08db56293ac4a3a6b205a28a9d84704435a672792b0974491314dc6d0c. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:35:25Z), 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/QZDA82556607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa96e388cbe2aca0a6a0d2ba938900183a350502f4b168c9e0bdaa2b22bb01b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZRP42521616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7e4c5f097a8d3bc8241d24e6393c2acdb3b9d7456b45698a097bd5b0aace4e. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:05:45Z), 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/QZTB42554384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b59ce97c34d38dc3cb7b519bb8a8ddf8e18a921e59277a6c457537ab26e5851. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T15:36:23Z), 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/QZWFH2540546.