Marcus Oliver Johnstone Mumford (born 31 January 1987) is a British singer, songwriter, musician, and record producer. He is the lead singer of the folk band Mumford & Sons and also plays a number of
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 0xe18910fdb26dc107fb9bcd5a5c1939ec9daeff131e8ae2a2fa96ebcea9b0367d. 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/9b4fac90-d8a6-4f15-add6-079841da6869.json and https://artists.proofprofile.net/proofs/artist/9b4fac90-d8a6-4f15-add6-079841da6869.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lay Your Head On Me (Jacques Lu Cont Vocal Mix)
Lay Your Head On Me - Jacques Lu Cont Vocal Mix
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 0x5b869f03996c72c4ed8776d48295812a552897b4a41cb82e5a2fd78621b41088. 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/QMUY42000062.
Lay Your Head On Me - Jacques Lu Cont Edit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4abe062a9cb32ac829c1141d2cc0e518e95f2106f00bbe24cf0f0501214b307e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMUY42000061.
Lay Your Head On Me (feat. Marcus Mumford) [Remixes]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25faeb6bdb4824d51e3c87a874272a1ec5b704f120b4eb89b6ab0d7867ff6cfe. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QMUY42000023.
Lay Your Head On Me (feat. Marcus Mumford) - Myd Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84965073443a9759fdd28b0ca3a0a2049e760b817036fe5dc4c97d141747f21. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMUY42000052.
Lay Your Head On Me (feat. Marcus Mumford) - Lost Frequencies Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bdeb7b61b87e453a469dcc0590689a08394740c41d82711475073706c36dcd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMUY42000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bb94f4ed70576a4d6f6ea999c40211fa74b5f2e83ac31224f12b17704bf218. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMUY42000036.
Inside Llewyn Davis: Original Soundtrack Recording
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbe3fa5cd28c908306aa4bc15d47140566759a11f8807894ecb0a53e595aac2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USNO11300699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25faeb6bdb4824d51e3c87a874272a1ec5b704f120b4eb89b6ab0d7867ff6cfe. 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/QMUY42000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6556026f963dde69e786f762729d0cd36b5f6261fdd0648a9f1a8e8283a975. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMUY42000039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25faeb6bdb4824d51e3c87a874272a1ec5b704f120b4eb89b6ab0d7867ff6cfe. 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/QMUY42000023.
Go Home (feat. Marcus Mumford) (The New Recording)
Wildewoman (The New Recordings) [Deluxe]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fde38a296d14c1108573c22aefe65a22fe23814941682b7fc40f521ab96f4c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USC4R2442263.
Lay Your Head on Me (feat. Marcus Mumford) - Joel Corry Remix
Lay Your Head On Me - Lost Frequencies Remix
Lay Your Head On Me (Lost Frequencies Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bdeb7b61b87e453a469dcc0590689a08394740c41d82711475073706c36dcd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMUY42000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1cd480116f14879e7467a3254cb30deb36f6a247388edf0401ab31d60764bba. 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/USAT22306147.