Mark Jacob Lenderman (born February 4, 1999), also known as MJ Lenderman and Jake Lenderman, is an American singer-songwriter and multi-instrumentalist. His style has been described as indie rock and
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 0x48ef94475d60efb25562e3dda19b582b153f649b2d2067b20c66cda9c459586b. 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/7c42ada7-7ec3-4d8c-80e1-10343c6bed4c.json and https://artists.proofprofile.net/proofs/artist/7c42ada7-7ec3-4d8c-80e1-10343c6bed4c.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 0xb8abd6c03a6b38131a3c69c95651684d47dc359b2e1256ef642724ac7ba6b50b. 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/QZ8LD1793931.
How Do You Let the Love Into the Heart That Isn't Split Wide Open
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4222cd1f28653b42f366a1570e257106165b4a92390858a6e9e517c8be059a6. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6N1936838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7a560eb124d533d0765a62565d5b1077650d26fd678ed3a384e57de1d697cd. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZFZ62113889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cbf66a32687d9ef51b192b1126747c23d1b43e09ea95ed7a284ff58e24c055. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZFZ62113890.
My Friend (feat. Kara Jackson & MJ Lenderman)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978be9e9bd0ed62f78f55c4baab7d2c28424df1bf7425c0981a60d037d42300d. 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/USRC12302490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4990ee9dd0a124b77a3cccf6f156fbe125ed46a7933a57c138b1b27927e510. 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/USEP42346004.
Dancing in the Club - MJ Lenderman Version
Dancing in the Club (MJ Lenderman Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cacb29f52eb6ec522338846a5112cfa36bff782c5640fcd44126dfcc1e5c06. 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/QZAZS2410812.