1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0xa007b537a2ea26e62d3f4a773515c42ee849b19541fe63325a053dfa743f31c9. 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/585b92dc-1fba-4c81-a28c-2db879b48558.json and https://artists.proofprofile.net/proofs/artist/585b92dc-1fba-4c81-a28c-2db879b48558.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. GET OTSBitcoinBlockVerifyURL → block OTSBitcoinBlock must exist at that height 3. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 4. GET OTSVerificationAPI → pre-computed 6-check result from server 5. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69014797114e0b08cd99dbc858d22b0f59efb97680946e56de1c59f671f32a6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/7FEW7nPIfVomhTuAQwwM7u.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/7FEW7nPIfVomhTuAQwwM7u.
{"copyright_id":"0xdce4c5e68052885ed10f700859b68be6daff5683209e3273e64c9ab62babe0e0","isrc":"BEY881000496","name":"Gratis,Belangeloos Voor Niets","registered_at":"2026-06-18T08:33:38Z","spotify_id":"1Lfui3hbfGH2ipIsP3wYiR","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce4c5e68052885ed10f700859b68be6daff5683209e3273e64c9ab62babe0e0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/1Lfui3hbfGH2ipIsP3wYiR.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/1Lfui3hbfGH2ipIsP3wYiR.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8f4bbbcfbae3fecfcc3bc32c14ea200939c3119d1eb6c30d14427d551bffa6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/0yDWVayT023hh4ViEIDtHW.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/0yDWVayT023hh4ViEIDtHW.
{"copyright_id":"0x729d7b41f8d8d3c3342fc0cfa0abffdee5655b7f0f51de4ae6586d59a13849c4","isrc":"BEY880600222","name":"Ik Heb Een Schip","registered_at":"2026-06-20T15:30:56Z","spotify_id":"1tS2DT8x0cFGqVWaKfH1ge","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729d7b41f8d8d3c3342fc0cfa0abffdee5655b7f0f51de4ae6586d59a13849c4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/1tS2DT8x0cFGqVWaKfH1ge.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/1tS2DT8x0cFGqVWaKfH1ge.
{"copyright_id":"0xdce4c5e68052885ed10f700859b68be6daff5683209e3273e64c9ab62babe0e0","isrc":"BEY881000496","name":"Gratis,Belangeloos Voor Niets","registered_at":"2026-06-18T08:33:38Z","spotify_id":"5FRWHO42h78zwMrwMajcQZ","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce4c5e68052885ed10f700859b68be6daff5683209e3273e64c9ab62babe0e0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/5FRWHO42h78zwMrwMajcQZ.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/5FRWHO42h78zwMrwMajcQZ.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8f4bbbcfbae3fecfcc3bc32c14ea200939c3119d1eb6c30d14427d551bffa6. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/1mONx7wHhKzUTLq71ZiMIQ.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/1mONx7wHhKzUTLq71ZiMIQ.
{"copyright_id":"0x89030d4c2e8f3427e1024f9abc2543535cc6dceae71833c862f11ced82a8527b","isrc":"BEY881600629","name":"Ballade van de kleinigheden","registered_at":"2026-06-25T03:00:30Z","spotify_id":"3q04M6pYgnP1bnLS3cWHeC","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89030d4c2e8f3427e1024f9abc2543535cc6dceae71833c862f11ced82a8527b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3q04M6pYgnP1bnLS3cWHeC.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3q04M6pYgnP1bnLS3cWHeC.
{"copyright_id":"0x17b88a94ddd20bfbdbe130c1d060740acf8f0162938ebf63791614716c485805","isrc":"BEY881200606","name":"Want Er Zijn Geen Wolven In Het Bos","registered_at":"2026-06-28T02:10:54Z","spotify_id":"2qeb5OUUA2lhR5njCxlt2A","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b88a94ddd20bfbdbe130c1d060740acf8f0162938ebf63791614716c485805. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2qeb5OUUA2lhR5njCxlt2A.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/2qeb5OUUA2lhR5njCxlt2A.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0289637e818602a9b5304347b66af9cfaf3c61574e9eaeeb72dccd557d959c0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/5otO6viwitq662jrkfeJOF.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/5otO6viwitq662jrkfeJOF.
Er Staren Steeds Meer Mensen Naar De Hemel
{"copyright_id":"0xc4c0cbfe55c71a8cf0b2694fe5572daf9ae4d320874e4cfb4f7e545bfd4ecca7","isrc":"DK5C50123172","name":"Tijd Genoeg","registered_at":"2026-06-09T01:32:15Z","spotify_id":"5JSr7KaIV8qZrdK7EY7br8","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c0cbfe55c71a8cf0b2694fe5572daf9ae4d320874e4cfb4f7e545bfd4ecca7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/5JSr7KaIV8qZrdK7EY7br8.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/5JSr7KaIV8qZrdK7EY7br8.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39215d05c2d6154357f1c3cab8f631b5cadf2505002058f1b61d40bda62e5944. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/6IkUs9TkH0VJZBG4YIu3Hj.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/6IkUs9TkH0VJZBG4YIu3Hj.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95759f7d4b93d684effecb5a25f519077209f878ad331fc2ea90e03693f2b836. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3sPOGD2vSGYPC76izVGPhN.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3sPOGD2vSGYPC76izVGPhN.
{"copyright_id":"0xd6ddb714fb801c0af28f595072fbad3715109b1ab3350d5156caff8c03f34fd8","isrc":"DK5C50123178","name":"Probeer Dan Niet Te Haten","registered_at":"2026-06-20T15:25:36Z","spotify_id":"5DhTUYez52CHeUaoAGlbzM","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ddb714fb801c0af28f595072fbad3715109b1ab3350d5156caff8c03f34fd8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/5DhTUYez52CHeUaoAGlbzM.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/5DhTUYez52CHeUaoAGlbzM.
{"copyright_id":"0xc064f219e298fef14aa6b0aadbe01ce5c1e14d7f79fb939d86629e1c8edeea4a","isrc":"DK5C50123180","name":"Muzikant (Over Heimwee en Verlangen)","registered_at":"2026-06-07T04:34:06Z","spotify_id":"66S3CyGpaogCA3emaO7mYU","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc064f219e298fef14aa6b0aadbe01ce5c1e14d7f79fb939d86629e1c8edeea4a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/66S3CyGpaogCA3emaO7mYU.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/66S3CyGpaogCA3emaO7mYU.
Als Ik Aan Jou Denk (Maar In de Verte...)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf996c660dcbae491cb79e18832c96d1e379129356f5108509967779215c92a81. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2PsFDLQrgpWCvMUd9DtNPu.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/2PsFDLQrgpWCvMUd9DtNPu.
The Gold Series - Afwachtend En Oplettend
{"copyright_id":"0x0836d698c3b0c23d09ec5998063ffcfdea71289f80bd8846face8d201b77f7bd","isrc":"NLAX70929543","name":"Er Staren Steeds Meer Mensen Naar De Hemel","registered_at":"2026-06-09T01:23:45Z","spotify_id":"3mmPHOxYFcfos9an5uJClZ","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0836d698c3b0c23d09ec5998063ffcfdea71289f80bd8846face8d201b77f7bd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3mmPHOxYFcfos9an5uJClZ.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3mmPHOxYFcfos9an5uJClZ.
{"copyright_id":"0x68659d086647a5a6f76156269d0e32edd05f7d2b64becacf06b8a6d94a06edea","isrc":"NLAX70929546","name":"Alles Zal Zich Weer Herhalen","registered_at":"2026-06-27T23:01:09Z","spotify_id":"4QUEFwOtudebgNrv7lp1A8","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68659d086647a5a6f76156269d0e32edd05f7d2b64becacf06b8a6d94a06edea. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/4QUEFwOtudebgNrv7lp1A8.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/4QUEFwOtudebgNrv7lp1A8.
{"copyright_id":"0x02d8e4bb084a733d6b437d7f72abf69d8f6d8d1fa316ac29b4cce2d0a58cb84b","isrc":"NLAX70929547","name":"Ik Heb Een Krekel In Mijn Huis","registered_at":"2026-06-25T02:52:09Z","spotify_id":"4yPZbDr0WkNHVijpLk3tWu","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d8e4bb084a733d6b437d7f72abf69d8f6d8d1fa316ac29b4cce2d0a58cb84b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/4yPZbDr0WkNHVijpLk3tWu.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/4yPZbDr0WkNHVijpLk3tWu.
{"copyright_id":"0xedc7af37f2e48850cabd883ff349e957495fe167ea7e5e5f6e1102b851853ab2","isrc":"NLAX70929549","name":"En Soms Waait Er Zoiets Als","registered_at":"2026-06-23T22:16:22Z","spotify_id":"6oUvV8IpnyIXOs2e3RBa24","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc7af37f2e48850cabd883ff349e957495fe167ea7e5e5f6e1102b851853ab2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/6oUvV8IpnyIXOs2e3RBa24.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/6oUvV8IpnyIXOs2e3RBa24.
{"copyright_id":"0x79c2b6ff6ec2f4769a0247a1da6baafa58cfd176f02fa0e8683ce3ab51d75930","isrc":"NLAX70929554","name":"Want Er Zijn Geen Wolven In Het Bos","registered_at":"2026-06-27T23:00:37Z","spotify_id":"3m0aq76rzJdMFd8WzQ6ceA","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c2b6ff6ec2f4769a0247a1da6baafa58cfd176f02fa0e8683ce3ab51d75930. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3m0aq76rzJdMFd8WzQ6ceA.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3m0aq76rzJdMFd8WzQ6ceA.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2179daba498ff2519e83b63f76e9d19baac54fe9c63118b72d55288c746305. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/5w3BUVw4ueIXbaT9N1rMxd.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/5w3BUVw4ueIXbaT9N1rMxd.
{"copyright_id":"0xfff2eebeff1ae17c76201d67e874ae67b0ed404420bc4a8f996b1b19f277db06","isrc":"DK5C50131280","name":"Wat Kan Ik Anders Doen","registered_at":"2026-06-19T20:33:04Z","spotify_id":"4PUbkqdbCCQFVlp5jLePkz","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff2eebeff1ae17c76201d67e874ae67b0ed404420bc4a8f996b1b19f277db06. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/4PUbkqdbCCQFVlp5jLePkz.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/4PUbkqdbCCQFVlp5jLePkz.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f821adea934a8366c8bd882780497503e52aae149d326195d2a8c21078679f6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3cOsk7PCl8yFxU2cLdWiV0.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3cOsk7PCl8yFxU2cLdWiV0.
{"copyright_id":"0xbf0ebb2d7724f0c673a236173039cff90e7a01f66838e8af4b47bc09c4d6c87b","isrc":"DK5C50131282","name":"'N Lied Voor Kinderen","registered_at":"2026-06-07T04:34:18Z","spotify_id":"1ZYOpeZkEgk2ZVH2GIFpRk","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0ebb2d7724f0c673a236173039cff90e7a01f66838e8af4b47bc09c4d6c87b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/1ZYOpeZkEgk2ZVH2GIFpRk.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/1ZYOpeZkEgk2ZVH2GIFpRk.
En Soms Waait Er Zoiets Als Vrede Door Mijn Hart
Op Het Toneel Van Alleen Maar Verbeelding
{"copyright_id":"0xed74253c81ef5b8827fdfe090db1269fac09f7c20459bba0f5caa0481c4b182f","isrc":"NLE320800636","name":"Over Heimwee En Verlangen","registered_at":"2026-06-26T08:39:57Z","spotify_id":"6XGdNQkRGzO3MjIYulDCO6","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed74253c81ef5b8827fdfe090db1269fac09f7c20459bba0f5caa0481c4b182f. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/6XGdNQkRGzO3MjIYulDCO6.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/6XGdNQkRGzO3MjIYulDCO6.