MEF may stand for: Government Ministry of Economy and Finance (Peru), the Peruvian ministry of economics and finance Ministry of Economy and Finance (Uruguay), the Uruguayan ministry of economics a
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 0x06aad747b1020d7893d13a43ad141e69e94aef44b6e81117ccbf94bcc24981dd. 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/141d0d0f-9e8b-4209-97e9-f79b1278697a.json and https://artists.proofprofile.net/proofs/artist/141d0d0f-9e8b-4209-97e9-f79b1278697a.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 0xfba2ee708714ad610673ac9a1b9de544a0d9052d29ed10e6486f5509d187973d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/USCGH1922426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1bfeee5d3649e7654b7717a4bd590c592b0379b6a5046f691cf419469875c4. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/GRPA11900508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddea4f8229736e8d317063092e34478c47258e61120688b410d9a80056af4ad. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/GRPA12000137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413656393ff654479fe567bff53debe6aaf6937b41cf4784f62da753dea2e34b. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/FR96X2094692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51c08e240d664bc55822cd96cf891f8d2a53902e9d611d3d9955f002a139efa. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FR96X2094694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2195c52f4de7e4a8ebb79061b327808e66c3392c56256c60f2be625e2a66f409. 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/FR96X2094704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddea4f8229736e8d317063092e34478c47258e61120688b410d9a80056af4ad. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/GRPA12000137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636424b5dd58a04354e96e143924308ff84380fdc276d1ea0e836dca80f4a758. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GRUM72003195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a2b7402998a576d72d33f112cca173e94be3954df4d7732e8d15ba7ce0420b. 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/GRUM72101004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3183bf798d4059dc347b4bf3e6008255a912b722edd1fbc74862259df3a27d44. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GRUM72102169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1c86a8db3b310f6cfcd540f0b427a4b98d2e6e85da8e9d0ccf567657a34e2b. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/GRUM72102948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc7292018add63dfd291a45a3b9d8759d42bb171a73af9f9f28bc285365e2d5. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/GRUM72102708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c5445a930b631e7cb2696d33d84b7a4d3e4b2f8c2ff85d258aa2e64335419b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GRSTY2400727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a84bd2135245643170eb14804be33bc7974ea7d0bfed80727550d7fe0ca9658. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/GRSTY2400728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88be2ccaac61c2015797834a2b6dae92ec9c005f513716ba0b42e636b4f9501. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GRSTY2402857.