Elfonda Mekel, (born 21 May 1970), better known as Once Mekel (, pronounced Ohn-chè), is an Indonesian singer, researcher, music industry observer, entrepreneur, and politician. He started his career
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 0x629c96f7a5445232959343efb6e9787c4e55f9b7239c90f986d561d9ae011de5. 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/88bbaba7-1bd3-4d27-a2b6-fdd713d4a031.json and https://artists.proofprofile.net/proofs/artist/88bbaba7-1bd3-4d27-a2b6-fdd713d4a031.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 0x02e691fdab77bc956506793c719d3678ea1710a6546c436c8a4c2bcfad9d83b0. 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/IDA041220106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c305113ff5a066abe4e10f98068a156401a9edcccac93d76d78cfe2595ff95. 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/IDA041220107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63df1da7898bbac15e79061351c90cbf2162ef78d65ab8f8d9c0f2f65de88a94. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/IDA041220108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6058f77e54da6f8bdcb79118f39e730e6db757eada9f45d18f59b6625fe4a57. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/IDA041520201.
Menaklukkan Dunia (Official Song Asian Games 2018)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f66df1cd54ac29a1b4e7b33f27439da09b8dd5df6a4609c4541c0a53ba28216. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/FR2X41819737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd003f332a5d55b265cfccda2bb4133ca27560c5e2fee52f0285eb8b9640f654e. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FR26V2042259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5cc531e8755f7c33e4d005327acd8bb98ca0b66c748e472d0372bca9cf1e6c. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/FR26V2042262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec2756c3dbb9db67c3d36afde0eb220d277d20ed23ae25fafdb72b5c5ea296b. 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/FR26V2042264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdaa62f69c1b57aa30b543187021009e0a483570c3dbc444339e54f5f665b06. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/FR26V2042266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e57b7df0c098bdcee0d0b235ed9ebb12280aa5a36c0edffb04cf33208b3e14c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR26V2042268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9cc874db687c771f0a88e7565548351c871d1cb06f5e9bed49b18eb9bb57b2. 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/FR59R2309509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2fd59e268d872caeab5ec6cb3ce06683062e3c232467c35145698d1797ebd70. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/FR59R2357812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f9c12de7e817883ab69571548bb9dea77facc88b9bcc2a2981be4218b5abda. 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/FR59R2357814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaeb1a6688614359a69c719f53ae4bd36177a89392b721503b48ffa888e4d20. 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/FR59R2357815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d055ed01293c6df547a92ee49757cda5ad8d09dac230065489dce3e4def94d. 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/FR59R2357817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e998fbc8510f314acde488899746d3f51cc82eb4464af81d0f9375721da2da8. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FR59R2357818.
Ditentukan Untuk Bersama - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b2f159551a87b0e31bb0a8d2d182ba1f002fd336f96adac0286c5e65fac1d2. 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/FR59R2357819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5b193c3492f2326eb16161728139b505991204824eb9fcd1a5d04e6619a72b. 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/IDA621900241.
Detik Waktu : Perjalanan Karya Cipta Candra Darusman
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a0f9c3158e35f690ad5406ac4d323e0e8ae98a5196a37be852e8b39e988c63. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR10S1878935.