Vadim Arnaud Constentin (; born 6 August 1986 in Nogent-sur-Marne), better known by his stage name Arno Cost, is a French musician, DJ and record producer. Biography Cost was born on 6 August 1986, i
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 0xa9527042d15f6e26dedd3b2d626586b82f48d43cc51fdea8a46cf37a91f86b1c. 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/ffd3df04-efaf-40e6-aa25-ba0bf3893c71.json and https://artists.proofprofile.net/proofs/artist/ffd3df04-efaf-40e6-aa25-ba0bf3893c71.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 0x9ad50f452a2d93d647284c15880e87031f0f069e01fb597307671a218c5f97c6. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/FRV600600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d69cb4e870d390547c817995448fbfee182675a3ac89b1552acb50e8b557255. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/FRV600600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad50f452a2d93d647284c15880e87031f0f069e01fb597307671a218c5f97c6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FRV600600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd485bfea5866d4bd522cd48941689760de291d8371f341e9f6c30207e56956. 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/GBHAD0700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc08f6edb001affd3cf35eb007b3eedfc7fdbb4b70d64177599a77c3a2fa8d7. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/GBHAD0700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b705b5cf50855030378188fff46183474d3f9e581717e050d968805444fd1ae. 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/FRV600700079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9065b1ae190bc94c0b8ecc2e5f4d1cb7be4a48b5fbe00d8989803694c456e3fc. 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/FRV600807302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7559a1bb19db9258bf356ad66ab46e20796731e599a39cc310cdeb5f2a2a810e. 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/FRV600807301.
Cr2 Presents LIVE & DIRECT Arno Cost & Norman Doray
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b7620e8e9f8622d4ef643745d64c9c4d6a038e9115e5de4a7af0209d6adeaa. 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/FRV600908602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53bd8b7d3844bb1eb67168a962eb6a7624ebfa35eacdaff43648f76a3b936270. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/FRV600908601.
Arno Cost & Norman Doray (Unmixed DJ Format)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e0598ba6ce076762aa15c92678671df884d4f590bf5daf811caa34d4d57f03. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/FRV601115001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fac71e60f7f03552e05ac80409390539b55cfe4aed9b844de775ee0a948ae1a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USYBL1400349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc944f1aff726c22d0d76b2038b6b4aa62a0da8de6d9ebb98060c2c89bc97b7a3. 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/FRV601300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc944f1aff726c22d0d76b2038b6b4aa62a0da8de6d9ebb98060c2c89bc97b7a3. 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/FRV601300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d997f8789426c5981a3c47b0447dfc4c4665a34717c57794ad6cc5a63d625ed. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FRV601300150.
Apocalypse 2014 - Kryder & Tom Staar Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26dc6741aea11097feb2308969813087c00b30561a35d3afde365242ec8484a. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/FRV601400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090b9342a2eda344deb00975f134b69725c7bab9b3fc0f4c249903c6e293cb99. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/FRV601400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a40b74b8f00ce61a0196a504a4a09fcdfd7aa331c32b744b162d6186193111d. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/FRV601400094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e94fd9a04131c7a376d996f926233f55580ead3eeae50b828dbf062204d33fe. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR9W11518273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e9d1e540d3b9dab899827466a7626c85250f7ccfc06d0d60b1ad65caa1532a. 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/GBKQU1653019.
Together (Junior Sanchez 2gether We Funk Remix)
Together (with Norman Doray) - Ferreck Dawn Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c50f51192a0c3d8a58546dad9b2ad15ee399a933c6ae34a9b7576846bec7cf. 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/GBUM71900621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef5a89b1d3d4aad2bb51d1fd46e4b55993a8449bb495a037df17c69421b4d21. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GBXGT1900205.
Darlin' (with Norman Doray) [Dance System Remix]
Darlin' (with Norman Doray) [Mark Broom Remix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f667ac783fd13068b0c4f822d3c7bf23961b6e2c7a78f21841f0d1569342ae. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/NLM5S2000910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7183e575a4728092e2a908dee3d23709755f6383648adb098f9683816ff163b0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRV602100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7183e575a4728092e2a908dee3d23709755f6383648adb098f9683816ff163b0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FRV602100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccef68443dde8dad125d500524e3ed79e38900d8576239eb7f72105f6f0ccdf. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/NLZ542100878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987bacee7c2187f6510711d7a6cd774823e25ebfa4b6cd68ec0bb31087485f6a. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/NLS6Y2200065.
Protocol presents Miami 2016 mixed by Florian Picasso & Blinders
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bfeacc315ca44d04bb0b0575a0f18b77e483d26957f87adfc9afa7de584908. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLUW21600279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b8a74eaa903d17a222b071334ddcbeda94d2ce9fea5a132439194a098d4426. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/FR2PA1100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6e357ecef0a410592f4487378a0fab3707c5683b753f90faea2a6e38b7ab5a. 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/AUDCB1701487.
Coming Alive (Mix Cut) - Simon de Jano & Maxwell Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a3b3d86490a41de5804143cb4e29bbe91a31acf5ce261360ec4c9158ddfaea. 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/NLUW21610015.
House Anthems: Best of 2019 (Presented by Spinnin' Records)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a30866320ecdf8cc9be9ce2f6dec392fc70b0a54a40de1c6c83639a8508ca69. 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/NLZ541901301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b7620e8e9f8622d4ef643745d64c9c4d6a038e9115e5de4a7af0209d6adeaa. 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/FRV600908602.
Electronic Music Anthology Vol.4 (by FG)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d69cb4e870d390547c817995448fbfee182675a3ac89b1552acb50e8b557255. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FRV600600021.