Jan Akkerman (born 24 December 1946) is a Dutch guitarist. He first found international commercial success with the band Focus, which he co-founded with Thijs van Leer. After leaving Focus, he continu
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 0xd51a6d69cae0485d54bf8f4a40e37291cb7339fdb21179eade0d45312dbe8707. 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/8ef1865d-9348-412c-9b91-192ac9a0c029.json and https://artists.proofprofile.net/proofs/artist/8ef1865d-9348-412c-9b91-192ac9a0c029.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 0xabff178a801861c9e105429257a798e8f64a76157d4b278ccc554f7f40c2c00d. 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/USAT20107633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66eea10e1162efdd93531f0d0f195ed4132d0d9787d6a94aedec59b577e7666e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USAT20107636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3475a4d035ad9aa4e72086665971ae610ab7e145a9234ac54924ed332397e27. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/NLA807600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484b13740e53c23f0bbb8437b3ce114ea42da79ce80bae207a0540ede5a11404. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/NLA807600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae13bd895435095e7165e34161c05b02356c08e4aaf1ff5f744c6d10f0cfc3e. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:06:42Z), 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/NLA807600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25563d38c61deec3f1536351e331e6c9355ec76b5f415de8f2dc201788f6078b. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/NLA807600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407401c5b2bca2a49f04eea77745a96946be5fde19bc08e0d71443e1735dabe0. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/NLA807600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b6471b9d9a4cc5e444b163184e8e6a7d632d13f9fdb2ee1b282ceeb3a134ff. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLA807700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2aa3d2d913f8d339f584bb14cbdef6a7bd95c80ad1f523144b3b7437fe0147. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NLA807700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49105cd4d0a94184a2e400f883963681b0ce41254a815c40e81b6c61b2d8b224. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLA807900037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42456a523046f227441e67cb83230cf2bf6cb944a44f15e5a63e78b7207635c4. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/NLA308500069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8944fb21973c9b642eaf72e11744585520e6930189dc0a63128875c3ca65e111. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/USUM71806519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753cb5017eac50e2aa00f77843ed8cf4f499e9b4019d39e12598f8e6f77cc2c2. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T18:25:52Z), 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/USUM71806517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c3095af02153e040da4f25f656989f948e90e7afc8cdbcc39181b305fa6597. 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/NLUM71600939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f237e3de5c9a7821114d73700987ea2d3f516cd7bfa65ff690a1169c841d63. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:31:44Z), 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/NLUM71700474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211e2d9af4d8c33721f74becace53f37d7f06c958208da2d5596ed87d38e2c3a. 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/NLUN21300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79e471cd4d605d1541b0813942e0ccf4fcc692794e3f57630f62e2cab69d529. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:29:38Z), 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/NLUN21300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042f3ddd2c554bc701bff273bea0f11442c45138167c99d795ba683749e7d948. 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/NLUN21300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c021f7052375527cccc50bad0add5c5643371abd698cdb08fdf4db834af61f4. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T11:09:14Z), 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/NLUN21300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cd903b282fc90ed51c0d285053ba488992cd56d94b22ac12f777ecec192b44. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/NLUN21300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d7d990efde6dedf01ef3411aa4307906fa864f941dbc797c5af690e96659d1. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/NLB931902202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0114760936f5409425fd9e186110ea8001a2c5f2d1ed432a33f48aeb91536303. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T02:02:40Z), 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/NLB931902204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd439dcfc8b348fee1675240f09836fb72a321905c325973eede602d10d0747c1. 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/NLB931902206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5b595b91a67e0a44307fab131210f18d81505ec7360459991581beccb5437a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NLB931902207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ab806b50c06ab705d757a82b8de0b38b85ca9b3eb234b87995a7f8819a6cdf. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/NLB931902208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce9dc094c7fdf3c0cfcf1ddea0d838c35542df09b674b99e8bf1279139ae7a8. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/NLB931902209.
Answers Questions - Questions Answers (Live)
Animals Reimagined - A Tribute to Pink Floyd
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4689f0227e9bec753ddd95431476a8138d7677c14ea46986a0c9e0a085bc3d21. 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/QM6XS2101318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66eea10e1162efdd93531f0d0f195ed4132d0d9787d6a94aedec59b577e7666e. 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/USAT20107636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dea7f95867d3a31b5879f29853e5e4b014988f0aaec61de87b2fc08c5b6d0d7. 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/QM6XS2300707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2408e61a32ea0573c0d29fe80ee32756cf7db160ee48f3f85adfcd849cd121a. 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/GBAYE9701222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3477fd87317151b7422574e43892a269dee135516fe71542b1ab7f73a0111342. 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/US3F71910711.
Jan Douwe Kroeske presents: The Best of 2 Meter Sessions 1987-2009
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda7514e864df84fb5f6c9b9cdd9999bca53b6e45b919e6cbe3f0ccad4308059. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/NL07C2061804.
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