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 0xb61c557b8c93dc31c68b68c40d9c793c2d4e379615dd31d428d742bb6a07aed9. 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/febb6369-2a61-4858-b57e-3e665c1fc72d.json and https://artists.proofprofile.net/proofs/artist/febb6369-2a61-4858-b57e-3e665c1fc72d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ave Maria, CG 89a (Arr. for Choir, Harp & Strings)
Catholic Classics, Vol. 4: Catholic Latin Classics
{"copyright_id":"0x9e75e4d99ddc751e2a8c147993d54e7a627b91ad521dd4f1a742ec5153608699","isrc":"US7850010087","name":"Ave Maria, CG 89a (Arr. for Choir, Harp & Strings)","registered_at":"2026-06-05T09:50:58Z","spotify_id":"0wbxedGYtz3EwZ8uBb3qYm","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 0x9e75e4d99ddc751e2a8c147993d54e7a627b91ad521dd4f1a742ec5153608699. 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/0wbxedGYtz3EwZ8uBb3qYm.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/0wbxedGYtz3EwZ8uBb3qYm.
Messe Solennelle, Op. 12, FWV 61: Messe solennelle, Op. 12, FWV 61: Panis Angelicus
{"copyright_id":"0x7ce8f6502e6c577ae7dbd8a815ba0d95599e4fb9aeffe9d3e300b312c5ba3400","isrc":"US7850010089","name":"Messe Solennelle, Op. 12, FWV 61: Messe solennelle, Op. 12, FWV 61: Panis Angelicus","registered_at":"2026-06-05T23:20:56Z","spotify_id":"7dm2a67i9k2x7IgtKNSawD","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce8f6502e6c577ae7dbd8a815ba0d95599e4fb9aeffe9d3e300b312c5ba3400. 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/7dm2a67i9k2x7IgtKNSawD.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/7dm2a67i9k2x7IgtKNSawD.
12 Songs of Various Nationality, WoO 157: No. 4, O Sanctissima
{"copyright_id":"0x9d4561fe509880ded3255c17be5ad75e662ab3caaa6e7e622bad7ff6647e3a7c","isrc":"US7850010092","name":"12 Songs of Various Nationality, WoO 157: No. 4, O Sanctissima","registered_at":"2026-06-04T16:12:51Z","spotify_id":"3jPviLnU1j4GHAKbmLTCEx","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4561fe509880ded3255c17be5ad75e662ab3caaa6e7e622bad7ff6647e3a7c. 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/3jPviLnU1j4GHAKbmLTCEx.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/3jPviLnU1j4GHAKbmLTCEx.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03de4d3ec9ce1d09dff2c8243189a41793cf0751767edf8968ac1829c52732c5. 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/0OAAm8jMDGdOaVeBszRplR.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/0OAAm8jMDGdOaVeBszRplR.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6628ac0a92b6affd9e9473b3bfc7831a4a10a4a7b94138d436906fe93ba2c05. 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/4CzbY2imZmfqdS7KUV8COO.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/4CzbY2imZmfqdS7KUV8COO.
{"copyright_id":"0x3c69e9b06abd69b2913a1b3a4f1fab70b7ed6efbb56f8071b5dcba369d4a8028","isrc":"US7850010105","name":"Tantum Ergo","registered_at":"2026-06-07T22:01:02Z","spotify_id":"1iTGWHHKDbTnc7rpOByMbJ","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c69e9b06abd69b2913a1b3a4f1fab70b7ed6efbb56f8071b5dcba369d4a8028. 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/1iTGWHHKDbTnc7rpOByMbJ.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/1iTGWHHKDbTnc7rpOByMbJ.
Ave Maria “Méditation sur le Premier Prélude de Piano de S. Bach” (Version for Voice & Piano)
{"copyright_id":"0x9e75e4d99ddc751e2a8c147993d54e7a627b91ad521dd4f1a742ec5153608699","isrc":"US7850010087","name":"Ave Maria “Méditation sur le Premier Prélude de Piano de S. Bach” (Version for Voice & Piano)","registered_at":"2026-06-05T09:50:58Z","spotify_id":"5L40FoIwMmS6mmOKOPziEg","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e75e4d99ddc751e2a8c147993d54e7a627b91ad521dd4f1a742ec5153608699. 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/5L40FoIwMmS6mmOKOPziEg.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/5L40FoIwMmS6mmOKOPziEg.
Messe a 3 voix (Mass in 3 voices), Op. 12, M. 61: Panis angelicus
Ellens Gesang III (Ave Maria!), Op. 52 No. 6, D. 839 "Hymne an die Jungfrau” [Version for Choir]
{"copyright_id":"0x4c7d6e687377f54afef457c835e1f4acfa547dd0cce5a07ff124cea2b1455734","isrc":"US7850010091","name":"Ellens Gesang III (Ave Maria!), Op. 52 No. 6, D. 839 \"Hymne an die Jungfrau” [Version for Choir]","registered_at":"2026-06-04T08:38:11Z","spotify_id":"00nLUlINJ71I4mCHXsy2JI","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7d6e687377f54afef457c835e1f4acfa547dd0cce5a07ff124cea2b1455734. 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/00nLUlINJ71I4mCHXsy2JI.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/00nLUlINJ71I4mCHXsy2JI.
12 Songs of Various Nationality, WoO 157: No. 4. O sanctissima
{"copyright_id":"0x9d4561fe509880ded3255c17be5ad75e662ab3caaa6e7e622bad7ff6647e3a7c","isrc":"US7850010092","name":"12 Songs of Various Nationality, WoO 157: No. 4. O sanctissima","registered_at":"2026-06-04T16:12:51Z","spotify_id":"6GrP9esTHrCNj22iO9y6I9","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4561fe509880ded3255c17be5ad75e662ab3caaa6e7e622bad7ff6647e3a7c. 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/6GrP9esTHrCNj22iO9y6I9.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/6GrP9esTHrCNj22iO9y6I9.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03de4d3ec9ce1d09dff2c8243189a41793cf0751767edf8968ac1829c52732c5. 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/4J1cCT3QJ5Eoa738nz5gn0.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/4J1cCT3QJ5Eoa738nz5gn0.
Exsultate jubilate, K. 165: Jubilate Deo - Version for Chorus
{"copyright_id":"0x915c19f7924524dff1e38c6e03cdf3d42498856278c41c80837c97a3ed3c18cd","isrc":"US7850010095","name":"Exsultate jubilate, K. 165: Jubilate Deo - Version for Chorus","registered_at":"2026-06-07T18:11:06Z","spotify_id":"24NzPPOmTGrjdyPaeDh4FE","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915c19f7924524dff1e38c6e03cdf3d42498856278c41c80837c97a3ed3c18cd. 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/24NzPPOmTGrjdyPaeDh4FE.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/24NzPPOmTGrjdyPaeDh4FE.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe4d70def8dd9ee8764b9968f39865955cd4ea990e320de8be78336c16a47fc. 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/287TBcbW5liRLcazMwK76c.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/287TBcbW5liRLcazMwK76c.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ba1709a83f9333716057ca34d8092013f555d1de4a9ff4e3207648319d391c. 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/1QuFoLav2QN4HFiVbYemrr.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/1QuFoLav2QN4HFiVbYemrr.
{"copyright_id":"0x26aefdd9ef4ffc271b590ad891b3268473689c45ad80a9ecd57451f23629cd7d","isrc":"US7850010104","name":"Adoramus te, Christe","registered_at":"2026-06-07T15:23:12Z","spotify_id":"2UPaBDW6UUyHujOJOlUd55","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26aefdd9ef4ffc271b590ad891b3268473689c45ad80a9ecd57451f23629cd7d. 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/2UPaBDW6UUyHujOJOlUd55.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/2UPaBDW6UUyHujOJOlUd55.
{"copyright_id":"0x3c69e9b06abd69b2913a1b3a4f1fab70b7ed6efbb56f8071b5dcba369d4a8028","isrc":"US7850010105","name":"Tantum ergo","registered_at":"2026-06-07T22:01:02Z","spotify_id":"0H0pdre62nttTcJlWSi5pH","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c69e9b06abd69b2913a1b3a4f1fab70b7ed6efbb56f8071b5dcba369d4a8028. 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/0H0pdre62nttTcJlWSi5pH.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/0H0pdre62nttTcJlWSi5pH.
{"copyright_id":"0xb146d21bf25e8be569281a6cfef2327d0b950b23f3fc3b9cc9ca38e2fc720d3f","isrc":"US7850010106","name":"Ecce sacerdos magnus","registered_at":"2026-06-07T15:28:05Z","spotify_id":"5h94Wfv2zmMyhxICJC6zY2","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb146d21bf25e8be569281a6cfef2327d0b950b23f3fc3b9cc9ca38e2fc720d3f. 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/5h94Wfv2zmMyhxICJC6zY2.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/5h94Wfv2zmMyhxICJC6zY2.