Marc Bauer (born May 28, 1975, Geneva, Switzerland) is an artist best known for his works in the graphic medium, primarily drawing. Life and career Marc Bauer studied at the Ecole supérieure d’art
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 0x0290b626a5da6761eb02f627ee348a626cb4eb9f939db30ce81d463e8d728029. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15df7060-5546-48ff-86dc-18366b3dddb5.json and https://artists.proofprofile.net/proofs/artist/15df7060-5546-48ff-86dc-18366b3dddb5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Histoire du Soldat, Pt. 1: "Voilà un joli endroit..."
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 0x0ff030fbb83db491e7b74715dcd0cd13daa631995dd5e3138bfb1ad6e2b661a8. 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/FRZ139610510.
Histoire du Soldat, Pt. 1: Marche du soldat (reprise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8cbdacf3af4880f365f2df863d50f40f2d33b1bd353a3119fa417eb523c900e. 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/FRZ139610540.
Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau (suite)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da1cc8e58e3c500f3c3d940ef534d21bda771d91b1c9813c1552d4ed9169151. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FRZ139610600.
Histoire du Soldat, Pt. 1: Marche du soldat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25347601ca14ce5e984e383fe8333883043809dd7b470ac811aaff0a926c7f37. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FRZ139610500.
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
Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7df34b239c25a3231d85f2fa29360c723bb99c1aa91e935a9945bde296753b5. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/FRZ139610520.
Histoire du Soldat, Pt. 1: "Donnez-moi votre violon..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dfffad84564bb0c7ded2376c735071d1a6cec3502bfffef9ea14f47744ba251. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ139610530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2812715cb5d84f3ceeaeffc848697e1fae381ac87dfbc2f6c34de8bdc4f43b4b. 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/FRZ139610560.
Histoire du Soldat, Pt. 2: Marche du soldat (reprise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965da4f7319b22f138d631d28ca8279647c07dfb42436161bbeb68440611019a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRZ139610610.
Histoire du Soldat, Pt. 2: Marche royale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752b1ca89274c6c66cea8bd88e3bbcfd0beb56f849550ba2a94581ab4d46f9a2. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRZ139610630.
Histoire du Soldat, Pt. 2: Petit concert
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea0e2b37fe065347a51253b95f8dc22a7fdec1db716c6437f81230085254556. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/FRZ139610650.