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 0xb76a13dc95005382920078093584641f4124ac12f53939d6e968c6d3baaa90b4. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/100473e5-312f-4228-ab9d-b351c965245d.json and https://artists.proofprofile.net/proofs/artist/100473e5-312f-4228-ab9d-b351c965245d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lady Day: The Complete Billie Holiday On Columbia (1933-1944)
Gloomy Sunday (with Teddy Wilson & His Orchestra) - Take 1
{"copyright_id":"0x169c1bded487cced627f7fa7ccdc43ed26682a17e915ccbc311a90ee469cf220","isrc":"USSM14100078","name":"Gloomy Sunday (with Teddy Wilson & His Orchestra) - Take 1","registered_at":"2026-06-04T16:17:51Z","spotify_id":"41CHb7F7SXcmkj0h8wekeF","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 0x169c1bded487cced627f7fa7ccdc43ed26682a17e915ccbc311a90ee469cf220. 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/41CHb7F7SXcmkj0h8wekeF.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/41CHb7F7SXcmkj0h8wekeF.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6eb8ac4465182b2640d46e8e7c9b6cd6a1c14ae7fef9426f3c9bdb82f12516. 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/79fXdfpOPGaXO1gfdq2onl.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/79fXdfpOPGaXO1gfdq2onl.
{"copyright_id":"0xc6e672ad58c0f1f177bbe2cdfcaa5be249cd7af4a82903f964d66101172c8be4","isrc":"USSM13800004","name":"You Go to My Head - Take 1","registered_at":"2026-06-07T04:33:57Z","spotify_id":"0JmzzjoM5HWgdEQxe58jNf","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e672ad58c0f1f177bbe2cdfcaa5be249cd7af4a82903f964d66101172c8be4. 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/0JmzzjoM5HWgdEQxe58jNf.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/0JmzzjoM5HWgdEQxe58jNf.
{"copyright_id":"0x19b3e4c08018134d765a5268ee58c27577bbaad4c225e1bae8eedf1e68d73af3","isrc":"USSM14200002","name":"Until the Real Thing Comes Along","registered_at":"2026-06-19T01:45:17Z","spotify_id":"5tlG5SCWKEteq8tOjcbo0g","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b3e4c08018134d765a5268ee58c27577bbaad4c225e1bae8eedf1e68d73af3. 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/5tlG5SCWKEteq8tOjcbo0g.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/5tlG5SCWKEteq8tOjcbo0g.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6004d17d766ff393b6f8a3a45c9b806e52abd6d1659319cceb2e8c4b13800bd. 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/0ewHkEC6Z8HKkciuZwSGqi.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/0ewHkEC6Z8HKkciuZwSGqi.
{"copyright_id":"0xb2c358ae6e855bcb4886b8c077d96fda7f91c53c3cd7009d97fe07d7e0410a03","isrc":"USSM10028641","name":"The Very Thought Of You","registered_at":"2026-06-06T14:31:39Z","spotify_id":"6SIBEYQtGMkZ8GUQsd1UbM","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c358ae6e855bcb4886b8c077d96fda7f91c53c3cd7009d97fe07d7e0410a03. 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/6SIBEYQtGMkZ8GUQsd1UbM.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/6SIBEYQtGMkZ8GUQsd1UbM.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31245411881c7f980ee032cb8c0e5c37772406fe39e9638469f6aafd9bd2d61. 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/0XsbCr34semDxq0ZX84BCh.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/0XsbCr34semDxq0ZX84BCh.
{"copyright_id":"0x8260d2923cfc1b305e3d2673f906d0d4f937d62032f52ce6a40fe3ca20ffd669","isrc":"USSM13700009","name":"They Can't Take That Away from Me","registered_at":"2026-06-19T21:25:47Z","spotify_id":"0jjnlXQlM6Gf5aRGHzihXU","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8260d2923cfc1b305e3d2673f906d0d4f937d62032f52ce6a40fe3ca20ffd669. 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/0jjnlXQlM6Gf5aRGHzihXU.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/0jjnlXQlM6Gf5aRGHzihXU.
{"copyright_id":"0xa6afc84ae31683e2b523694832176c3d6c3a8446a05832a67dee5360f7f6864c","isrc":"USSM13700010","name":"I've Got My Love to Keep Me Warm","registered_at":"2026-06-08T10:20:42Z","spotify_id":"4swVkhYwnmA0ls8UWzz5VU","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6afc84ae31683e2b523694832176c3d6c3a8446a05832a67dee5360f7f6864c. 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/4swVkhYwnmA0ls8UWzz5VU.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/4swVkhYwnmA0ls8UWzz5VU.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d9538223c3661f6965ecc50ec917e32b17f1ccf1157bda69954fba971151fa. 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/6RLOlJ5mbK1hKst0qNjLfA.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/6RLOlJ5mbK1hKst0qNjLfA.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda12c2b19b7c8ef0b289c5212740f0e964a921bb576b057ee31171db62130901. 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/7s4jqO4hZchhEXuMn6EYHM.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/7s4jqO4hZchhEXuMn6EYHM.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267a5b28e3f32e4823913a95c7cffab1b0692937a32562fc23e28ef84e83115a. 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/0GTJWvWW3b9pimWyh1MNRX.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/0GTJWvWW3b9pimWyh1MNRX.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f59ef16c9a39b3aac3b95a9397c49d8859fea0996d880db00572133dc4ed1c. 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/1Ho5yh1ilM9v2SjfV0yjCH.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/1Ho5yh1ilM9v2SjfV0yjCH.
{"copyright_id":"0x7c42f471e9afe3d959154722f216e8b1dbbd3d7dfed64ea9ca4c6921d3402468","isrc":"USSM13600004","name":"The Way You Look Tonight","registered_at":"2026-06-07T10:49:16Z","spotify_id":"0ywbgYYinAodsw1dm1lYe8","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c42f471e9afe3d959154722f216e8b1dbbd3d7dfed64ea9ca4c6921d3402468. 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/0ywbgYYinAodsw1dm1lYe8.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/0ywbgYYinAodsw1dm1lYe8.
{"copyright_id":"0x43cd627924b5c348ef9ee4e7940470adb2dd0f9619fbf6e1929022dde7ac4922","isrc":"USSM13500015","name":"If You Were Mine","registered_at":"2026-06-21T15:30:47Z","spotify_id":"3EdzZGdQAFbwN8xf6GKBMa","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cd627924b5c348ef9ee4e7940470adb2dd0f9619fbf6e1929022dde7ac4922. 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/3EdzZGdQAFbwN8xf6GKBMa.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/3EdzZGdQAFbwN8xf6GKBMa.
I Can't Believe That You're In Love With Me
{"copyright_id":"0xbae7ccdfb3f4b3e58cc54cb532bf216414ca066544e6917c3529c1a485a32f9f","isrc":"USSM13800006","name":"I Can't Believe That You're In Love With Me","registered_at":"2026-06-06T20:57:08Z","spotify_id":"6nYyd4vfb831h391mt3GWU","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae7ccdfb3f4b3e58cc54cb532bf216414ca066544e6917c3529c1a485a32f9f. 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/6nYyd4vfb831h391mt3GWU.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/6nYyd4vfb831h391mt3GWU.
{"copyright_id":"0x5b44ca67d6bebf0bfb754c302b7a4dfece07f9b005795f5d59856cd865ac403b","isrc":"USSM14100005","name":"Let's Do It (Let's Fall In Love)","registered_at":"2026-06-21T15:24:52Z","spotify_id":"1qKfS1Qk4499iC7mDDkLpO","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b44ca67d6bebf0bfb754c302b7a4dfece07f9b005795f5d59856cd865ac403b. 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/1qKfS1Qk4499iC7mDDkLpO.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/1qKfS1Qk4499iC7mDDkLpO.
{"copyright_id":"0xfb8281ab39bc4d33d0d391c40c43248404a10fa6b07190965bedf3fe58cc6e8b","isrc":"USMC14448351","name":"I'll Be Seeing You","registered_at":"2026-06-01T08:11:14Z","spotify_id":"4smkJW6uzoHxGReZqqwHS5","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8281ab39bc4d33d0d391c40c43248404a10fa6b07190965bedf3fe58cc6e8b. 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/4smkJW6uzoHxGReZqqwHS5.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/4smkJW6uzoHxGReZqqwHS5.