Alberto Mendoza Nieves (born February 15, 1978), also known as MC Ceja, is a Puerto Rican rapper and singer. He is also known as El Cejón due to his heavy eyebrows. Biography MC Ceja was born in Ar
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 0xe1ffafe0d94edc6789c1fc4cc5d4a10fbbdcf412ff041a621b2083d0f9172bfb. 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/34d755ab-b289-42db-87ce-7bc58b080f38.json and https://artists.proofprofile.net/proofs/artist/34d755ab-b289-42db-87ce-7bc58b080f38.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nico Canada Presenta A lo Under, Vol. 1 Perreo Perreo
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 0x6d435362238c72124f24c71b2815f21375a69bb85210e2a20a52815940915ed3. 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/US9PJ1200036.
Playero Dj Presenta Exitos '95 / 17Th Anniversary (Underground Reggaeton Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482618705a262d9bab21a9cb332bd3f3bb0e9f794a2932fc425ac233014b9741. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USDHM1206323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c1ef29a5fcb289815d392e1550a162075506d718312bfceee384c7b3dea179. 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/QMDA61810231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7217116ea182ecd60fe55fcefa450853ba8f2e825ec78457d9dd380e6daf281f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QMKXD1802410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5cd9e151dd464bf62fca1fcfd111f82ee3b090dc73401af939f968aa0e96c7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCACI1534386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d2298ae55e3a850cd87e91da08be6ebf3ee3847b5f6202baf75f5ba7829236. 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/UST2K0900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8cd5a41df93b298fae1eec42c48b0e5e18c4eeb3be352d335d0b2d66a47772. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QM6N21876216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6f0c61b16f8c323905293b07a636796b0546c02648bfc2190cbad67a6b1e0d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM6N21876215.
Free Tempo Remix (feat. MC Ceja, Mexicano & Getto y Gastam)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0e0662ad8083c880f08b2381d2e57c5493adb3a2a1865fcf59ec3886c3c80c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:55:59Z), 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/USASN1301055.
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 0xcff04ee0a1e46a0ca4db2019326d243a89f29cc1eb2b0e5c604b05fd43938c1e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QMDA71869026.
Tratan Pero No Podran / Ven y Baila No Pares
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34149180b31cf31a7fdb52737d0adc03465de81945cdb762965f83decbd70e3d. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QMEDD1300166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e7f824abaceb2d85c8bbf31944d2475e8ffc79b92848a39120030fe36e268b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR26V1544655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6994c452641b6cd98d2f2a53afc9eac5d041bb3b3fc5d940c708cfe8b94b70f8. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QM6N21876188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08140eefb32baae88542f49d145b2409ec238c6d29a8e563206b4aea694a368a. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QM6N21876213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfcc24ac0a7a09b52f4fee2270e907f790688c8cea58e7cf29f34c487b93d243. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QM6N21882272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249bfc8678d7d33ba5597345f848c3c394338a5fcb195bd3c0b072bbe3541cd9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM4TW1762966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690837d50ab7dcc9cd6aaf38fc5855d87eb3c30b146116f98c1ce6196409b6ee. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QM6N21876227.