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 0xdb876d660dfadd7b6159ef8f919c2ef058786401123f89cfe339464fc98b490f. 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/fc9afc1d-6efe-49f3-86e3-3815ccbb1967.json and https://artists.proofprofile.net/proofs/artist/fc9afc1d-6efe-49f3-86e3-3815ccbb1967.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
{"copyright_id":"0x7a986b07c339e45340ddaee280a59d2d18d668640750aab4e4fdbe0f11aaba55","isrc":"BCKKP2300073","name":"Fuma do Kunk Amor - Remix","registered_at":"2026-06-08T20:11:25Z","spotify_id":"4AjB7gGKelqwD5eXG5hDQP","type":"track"}
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 0x7a986b07c339e45340ddaee280a59d2d18d668640750aab4e4fdbe0f11aaba55. 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/4AjB7gGKelqwD5eXG5hDQP.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/4AjB7gGKelqwD5eXG5hDQP.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc567947558b00ba32008892c9468ac0ed812539098ec2ed90906be729d33a3e6. 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/2ExxuGFGjXMuwSYMfsP9Fy.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/2ExxuGFGjXMuwSYMfsP9Fy.
{"copyright_id":"0x499701f369121200b6770a752c3850c3f1ddd44fcb4e893b26adb8caf76c2d8d","isrc":"BRUM72300233","name":"Conto Da Bandida","registered_at":"2026-06-07T20:07:42Z","spotify_id":"6KAt9RKQU0VvLFNgpxBfXO","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499701f369121200b6770a752c3850c3f1ddd44fcb4e893b26adb8caf76c2d8d. 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/6KAt9RKQU0VvLFNgpxBfXO.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/6KAt9RKQU0VvLFNgpxBfXO.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6b30d7f1fd4f96eb8b989460f06204a21ca57a6aba3919af235ddd122688d7. 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/0Exm016xcfPAqKyP1uSO8v.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/0Exm016xcfPAqKyP1uSO8v.
{"copyright_id":"0xfa9a87b8966e18a19bab379cb401c761cb74c24abcce0202dd5e033b9b21c2fc","isrc":"BCKKP2500001","name":"Minha Ex de Volta","registered_at":"2026-06-05T12:33:27Z","spotify_id":"5ljvo0PWI0lqTN4NDVFurH","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9a87b8966e18a19bab379cb401c761cb74c24abcce0202dd5e033b9b21c2fc. 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/5ljvo0PWI0lqTN4NDVFurH.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/5ljvo0PWI0lqTN4NDVFurH.
{"copyright_id":"0xedb4a593e96d56d3c180e6f0f49e147bebbc2050a7b2947f2807edcbeab5317b","isrc":"BCKM42400003","name":"Clack Bum - Versão Forró","registered_at":"2026-06-21T02:41:45Z","spotify_id":"70Fl4xe134PseZ7jWl1ixy","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb4a593e96d56d3c180e6f0f49e147bebbc2050a7b2947f2807edcbeab5317b. 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/70Fl4xe134PseZ7jWl1ixy.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/70Fl4xe134PseZ7jWl1ixy.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad540e76a78ba946320b95bb917589222abe52a7a83c0363c7b0feb6a88f520d. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/4wrw2u3aNC7v1AA48A0KT8.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/4wrw2u3aNC7v1AA48A0KT8.
{"copyright_id":"0x5afac4c25e07cae5e6ae6be4c0c2fe1169a0dba2fea38167c29745e8aec4fc04","isrc":"BRUM72301283","name":"Bonita E Gostosa","registered_at":"2026-06-19T08:01:48Z","spotify_id":"3e5gb56pcMsaG8vH0PqBrc","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afac4c25e07cae5e6ae6be4c0c2fe1169a0dba2fea38167c29745e8aec4fc04. 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/3e5gb56pcMsaG8vH0PqBrc.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/3e5gb56pcMsaG8vH0PqBrc.
{"copyright_id":"0x653cb80550c19ba6b41b0be46d77f2501ae84113eceb8f0821ea0ea5a1dd23c1","isrc":"BCKKP2300053","name":"Mas Existe um Lugar - Remix","registered_at":"2026-06-04T14:03:31Z","spotify_id":"4FKHFcKf0wmowGWbvfLrTn","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653cb80550c19ba6b41b0be46d77f2501ae84113eceb8f0821ea0ea5a1dd23c1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/4FKHFcKf0wmowGWbvfLrTn.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/4FKHFcKf0wmowGWbvfLrTn.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b21200ed8ff53ede42446a7937a71117de3372146e0e5a56a23a81ba465e3d. 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/10eMzFWRAD6A5iEKcY1uf6.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/10eMzFWRAD6A5iEKcY1uf6.
Vai Novinha An An An / Citação: O Chêro Da Carolina
{"copyright_id":"0x8be4cc7579ea506d20aeec51df666a3623b1e42106059f433d0a918df0a405e4","isrc":"BCWV12300017","name":"Vai Novinha An An An / Citação: O Chêro Da Carolina","registered_at":"2026-06-06T10:32:02Z","spotify_id":"4Ll8kcOnu9wcUvf81sWln5","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be4cc7579ea506d20aeec51df666a3623b1e42106059f433d0a918df0a405e4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/4Ll8kcOnu9wcUvf81sWln5.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/4Ll8kcOnu9wcUvf81sWln5.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0218bb20de40113734883d985e348e8652bc21b1d4eb20c024de52bbc78a66. 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/4SKrgwolhav2i1NXhjHMix.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/4SKrgwolhav2i1NXhjHMix.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a71d5ba861a5e8375f77642e068eea067141673f71c64d4660051b7c76e13e. 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/0XSj5qHB8RW0i4tAgZp1us.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/0XSj5qHB8RW0i4tAgZp1us.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b289c8102fb251e81d311b7d0ff7706a494c3ab53f09b2ee39425fbf443613. 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/7h7CfpBfwRfCgPT5FhP3GG.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/7h7CfpBfwRfCgPT5FhP3GG.
{"copyright_id":"0xce86157ba50377f2f99eb18ba4393fd2c1e207ac3dad14b37327945171e6d164","isrc":"BCKKP2300019","name":"Te Ver de Novo - Speed","registered_at":"2026-06-07T07:35:27Z","spotify_id":"5UYOn09MNLlojC4OXTXcNE","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce86157ba50377f2f99eb18ba4393fd2c1e207ac3dad14b37327945171e6d164. 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/5UYOn09MNLlojC4OXTXcNE.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/5UYOn09MNLlojC4OXTXcNE.
{"copyright_id":"0xc1041dc2273a1f3601c92d142764d7668ca5210e6267be36fa77cd1f4e203eb0","isrc":"SGB502340637","name":"Mas Existe um Lugar - speed","registered_at":"2026-06-04T09:39:14Z","spotify_id":"21XQbePSeOSvfuLRaZbZ7a","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1041dc2273a1f3601c92d142764d7668ca5210e6267be36fa77cd1f4e203eb0. 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/21XQbePSeOSvfuLRaZbZ7a.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/21XQbePSeOSvfuLRaZbZ7a.
{"copyright_id":"0xf27475cbe93debf7d57b6f6e5405c6fd8960f41ad22e69cb115ce72e791dd7e0","isrc":"SGB502340678","name":"Mas Existe um Lugar","registered_at":"2026-06-04T08:18:26Z","spotify_id":"7IN41XfDoGETfFsARAHOsv","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27475cbe93debf7d57b6f6e5405c6fd8960f41ad22e69cb115ce72e791dd7e0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/7IN41XfDoGETfFsARAHOsv.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/7IN41XfDoGETfFsARAHOsv.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3854e966557ee0c9d2423bab20661a242818d72af2b86cb4d3bd1a558e7394b9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2vJzeuKQ3tFKmSMkdbALKp.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/2vJzeuKQ3tFKmSMkdbALKp.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0db8371a700ba2c691d663ffac73c02cb02431006975519dd3b978aafc9668. 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/3vtTkYWuCS5yYbdRiVuvPG.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/3vtTkYWuCS5yYbdRiVuvPG.
{"copyright_id":"0xe8f5f3176ecde6ed20d31f8830ea003112b4ef78350def75f91532bbce244fa7","isrc":"BRUM72202339","name":"Formosa 2 - Speed","registered_at":"2026-06-06T17:18:09Z","spotify_id":"5VCtUXnXNEoSQ9hnXdQNvO","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f5f3176ecde6ed20d31f8830ea003112b4ef78350def75f91532bbce244fa7. 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/5VCtUXnXNEoSQ9hnXdQNvO.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/5VCtUXnXNEoSQ9hnXdQNvO.
{"copyright_id":"0xa3be9554f3cf364026d94eca71ed778b743053e24dfbdca26efa7edadb949544","isrc":"BRUM72202218","name":"Sou Eu - Speed","registered_at":"2026-06-08T12:16:09Z","spotify_id":"7oJz4UAl1txNYgzbJGIE3H","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3be9554f3cf364026d94eca71ed778b743053e24dfbdca26efa7edadb949544. 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/7oJz4UAl1txNYgzbJGIE3H.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/7oJz4UAl1txNYgzbJGIE3H.
{"copyright_id":"0x078bb81a4be7dffd0cdc1b5eb7e11d11cf2d8127dacf4282f5dafcf568bb74df","isrc":"BRUM72202102","name":"Sou Eu","registered_at":"2026-06-27T02:50:53Z","spotify_id":"0ahG0JBHpKhqA5o7J51WmB","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078bb81a4be7dffd0cdc1b5eb7e11d11cf2d8127dacf4282f5dafcf568bb74df. 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/0ahG0JBHpKhqA5o7J51WmB.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/0ahG0JBHpKhqA5o7J51WmB.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0206f3bfc079495da3759f6c731e7d2ff945fd734f3db9adc5838354b4c9ebd. 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/0pxSGpLJliHNfQ4ojKJ3D9.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/0pxSGpLJliHNfQ4ojKJ3D9.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d7a525929077f8a32afcd358750792f17d61855b5cda31389b627eecf95a62. 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/7qi0QO42ENMv5Np4k767BS.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/7qi0QO42ENMv5Np4k767BS.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c32132cdfe10112f6987cbf87fd2f493b9906893ce75fc0f8ac8da62c0f9620. 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/1Ob4WcZui7TLPm5gMBuhWX.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/1Ob4WcZui7TLPm5gMBuhWX.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d24d4ecd30f5beca24eddc7f979d59ee280480cf13608fd74d72093085f8628. 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/0Xy00DQXCP4d5cjNlcDSFU.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/0Xy00DQXCP4d5cjNlcDSFU.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa492d4ba8f587de7371a51d57f9bd0921a6335a915518de15318856f19bba912. 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/4O9s899yXSNPR1wP4ZsFMC.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/4O9s899yXSNPR1wP4ZsFMC.