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 0x507a4ad7b1babe5f79cf2f0061e09d4009a1df4abd69157d9aa5648b4e4c01a5. 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/4441bddf-4082-41c3-9881-fd7bb38229a3.json and https://artists.proofprofile.net/proofs/artist/4441bddf-4082-41c3-9881-fd7bb38229a3.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 0x732f0eb460327959784e4d314c14bfe7468d6595549a2c75cf07d5f8d59276f8. 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/50Yg3AXyctwuzN5anGviB2.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/50Yg3AXyctwuzN5anGviB2.
{"copyright_id":"0x7d4f0ba4df58148a2e5f2fa0316e408fcc1264be6fcdeeeb9413d3db7b8fc5c9","isrc":"GBBGL0001370","name":"Sailing over the Dogger Bank","registered_at":"2026-06-10T19:25:05Z","spotify_id":"7zDcDOmQvAAmhrBWXeyyGr","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4f0ba4df58148a2e5f2fa0316e408fcc1264be6fcdeeeb9413d3db7b8fc5c9. 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/7zDcDOmQvAAmhrBWXeyyGr.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/7zDcDOmQvAAmhrBWXeyyGr.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1098c4d3f91fc867053c0c64bf97cd2d77503122948113337d8b58474cda6bd. 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/6zAt1Ov6wHTm6OOW8zFbxl.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/6zAt1Ov6wHTm6OOW8zFbxl.
{"copyright_id":"0x16fcd4d262c001d225c05cceb4a0765c76eeaca474c499b9d06f847412575d19","isrc":"GBBGL0001412","name":"Death of Nelson","registered_at":"2026-06-10T05:40:33Z","spotify_id":"6hRt3SliQHgn2orGYdqjEc","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fcd4d262c001d225c05cceb4a0765c76eeaca474c499b9d06f847412575d19. 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/6hRt3SliQHgn2orGYdqjEc.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/6hRt3SliQHgn2orGYdqjEc.
Concerto for 2 Mandolins in G Major, RV 532: III. Allegro
Vivaldi: Concerti "Con molti istromenti"
{"copyright_id":"0x126c1fdfce37a1bf73ec57da55de68b136fd5fa27be5edaf46da777c21dac336","isrc":"DEF058501263","name":"Concerto for 2 Mandolins in G Major, RV 532: III. Allegro","registered_at":"2026-06-04T06:46:35Z","spotify_id":"4KNRyYkqFE3uyWoE3t4q6L","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126c1fdfce37a1bf73ec57da55de68b136fd5fa27be5edaf46da777c21dac336. 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/4KNRyYkqFE3uyWoE3t4q6L.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/4KNRyYkqFE3uyWoE3t4q6L.
Concerto for 2 Mandolins in G Major, RV 532: I. Allegro
{"copyright_id":"0x8556caeb3e7eccc80811c8109ffaea98d236aefa43cac3e143d75688cda3f43b","isrc":"DEF058501261","name":"Concerto for 2 Mandolins in G Major, RV 532: I. Allegro","registered_at":"2026-06-04T15:52:48Z","spotify_id":"3rKLlKOvgcbqEKTEyhIOuL","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8556caeb3e7eccc80811c8109ffaea98d236aefa43cac3e143d75688cda3f43b. 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/3rKLlKOvgcbqEKTEyhIOuL.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/3rKLlKOvgcbqEKTEyhIOuL.
Concerto for 2 Mandolins in G Major, RV 532: II. Andante
{"copyright_id":"0xb666c9bce048c9346a0b2cdf93cf7c10704012b6c5e3f981d95b925cbb229b53","isrc":"DEF058501262","name":"Concerto for 2 Mandolins in G Major, RV 532: II. Andante","registered_at":"2026-06-07T20:48:58Z","spotify_id":"5WplpCcba2LVN7fND842f6","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb666c9bce048c9346a0b2cdf93cf7c10704012b6c5e3f981d95b925cbb229b53. 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/5WplpCcba2LVN7fND842f6.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/5WplpCcba2LVN7fND842f6.
Vivaldi: The Four Seasons; Concertos etc.
{"copyright_id":"0x126c1fdfce37a1bf73ec57da55de68b136fd5fa27be5edaf46da777c21dac336","isrc":"DEF058501263","name":"Concerto for 2 Mandolins in G Major, RV 532: III. Allegro","registered_at":"2026-06-04T06:46:35Z","spotify_id":"7JB8yh05AvLLXujYsiUkQs","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126c1fdfce37a1bf73ec57da55de68b136fd5fa27be5edaf46da777c21dac336. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/7JB8yh05AvLLXujYsiUkQs.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/7JB8yh05AvLLXujYsiUkQs.
{"copyright_id":"0x8556caeb3e7eccc80811c8109ffaea98d236aefa43cac3e143d75688cda3f43b","isrc":"DEF058501261","name":"Concerto for 2 Mandolins in G Major, RV 532: I. Allegro","registered_at":"2026-06-04T15:52:48Z","spotify_id":"04Fnc7bS0Jk1Z7F99zbqC1","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8556caeb3e7eccc80811c8109ffaea98d236aefa43cac3e143d75688cda3f43b. 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/04Fnc7bS0Jk1Z7F99zbqC1.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/04Fnc7bS0Jk1Z7F99zbqC1.
{"copyright_id":"0x8556caeb3e7eccc80811c8109ffaea98d236aefa43cac3e143d75688cda3f43b","isrc":"DEF058501261","name":"Concerto for 2 Mandolins in G Major, RV 532: I. Allegro","registered_at":"2026-06-04T15:52:48Z","spotify_id":"6CcSBgU2Zx2lgskJAFZimF","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8556caeb3e7eccc80811c8109ffaea98d236aefa43cac3e143d75688cda3f43b. 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/6CcSBgU2Zx2lgskJAFZimF.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/6CcSBgU2Zx2lgskJAFZimF.
{"copyright_id":"0xb666c9bce048c9346a0b2cdf93cf7c10704012b6c5e3f981d95b925cbb229b53","isrc":"DEF058501262","name":"Concerto for 2 Mandolins in G Major, RV 532: II. Andante","registered_at":"2026-06-07T20:48:58Z","spotify_id":"6jhnk9Kl6cToXTAqgRSgjX","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb666c9bce048c9346a0b2cdf93cf7c10704012b6c5e3f981d95b925cbb229b53. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/6jhnk9Kl6cToXTAqgRSgjX.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/6jhnk9Kl6cToXTAqgRSgjX.
Concerto for 2 Mandolins, Strings and Continuo in G Major, RV. 532: I. Allegro
Concerto for 2 Mandolins, Strings and Continuo in G Major, RV. 532: II. Andante
Concerto for 2 Mandolins, Strings and Continuo in G Major, RV. 532: III. Allegro
{"copyright_id":"0x8556caeb3e7eccc80811c8109ffaea98d236aefa43cac3e143d75688cda3f43b","isrc":"DEF058501261","name":"Concerto for 2 Mandolins, Strings and Continuo in G Major, RV. 532: I. Allegro","registered_at":"2026-06-04T15:52:48Z","spotify_id":"7wgdQBcYXlMzz8zBqBEwDF","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8556caeb3e7eccc80811c8109ffaea98d236aefa43cac3e143d75688cda3f43b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/7wgdQBcYXlMzz8zBqBEwDF.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/7wgdQBcYXlMzz8zBqBEwDF.
{"copyright_id":"0xb666c9bce048c9346a0b2cdf93cf7c10704012b6c5e3f981d95b925cbb229b53","isrc":"DEF058501262","name":"Concerto for 2 Mandolins, Strings and Continuo in G Major, RV. 532: II. Andante","registered_at":"2026-06-07T20:48:58Z","spotify_id":"3Xf9MKV7Gon6h3jWjBd5PA","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb666c9bce048c9346a0b2cdf93cf7c10704012b6c5e3f981d95b925cbb229b53. 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/3Xf9MKV7Gon6h3jWjBd5PA.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/3Xf9MKV7Gon6h3jWjBd5PA.
{"copyright_id":"0x126c1fdfce37a1bf73ec57da55de68b136fd5fa27be5edaf46da777c21dac336","isrc":"DEF058501263","name":"Concerto for 2 Mandolins, Strings and Continuo in G Major, RV. 532: III. Allegro","registered_at":"2026-06-04T06:46:35Z","spotify_id":"5uUzNK5PjgpCKa5ShojX7U","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126c1fdfce37a1bf73ec57da55de68b136fd5fa27be5edaf46da777c21dac336. 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/5uUzNK5PjgpCKa5ShojX7U.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/5uUzNK5PjgpCKa5ShojX7U.