thumb|right|220px|Fristorp in 2022 Karl Göran Fristorp (26 May 1948 – 3 September 2024) was a Swedish singer and songwriter. Fristorp along with Claes af Geijerstam as the duo Malta won Melodifestival
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f46f10ed9e2838633de793059ad790cd0140798d3ee8142d41e0ec7a38e1fff. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ca62a5e-5240-4d87-a659-866029ca00be.json and https://artists.proofprofile.net/proofs/artist/6ca62a5e-5240-4d87-a659-866029ca00be.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87988267bcb378eeb9c11cb6ea93a8f8f53c82a6908ebab2695e708e51fa022b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOAMM0400442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdfbe508debb00f61b114c62072cb39b876061dda9cca06317031047000a232. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOUM71102166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfdecc92f1793b5b9f814c08f8d0b9d90bd003a94e3ceda2922d2bd70ef570f1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOUM70500543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffed6b2e1ceec994076b09447cb99973003ee4798ef5e9b91856b3484324f2fe. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOAMM0400431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd9468ae8bafff749f046caf2f779047fce1131e6a4210b4220f04cc4b1a63b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOAMM0400434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfaa2093f0a06ce0a407cdfdc1dbb4cff781c7a450b7ca37975cd5a1415bd39a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOUM71102154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bc097ceb0d4c614e5d51f581aa5f1f6aef4bb3818ed78c1a373f0d38521857. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOUM71102157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054bfdc67f490a7c7098211b41fd5ab9dd1f98f0f9510fad6ff781a2910da1cf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOHEK0801020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a19664afacee7832eec1dd4c92de6092aa302d5b8677c2cc762a5e8c204bbf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOHEK0801040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74649eee15b379787e2624dc57231339b7b4dcc378a2bcbab24cad8b3dd1576a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOHEK0801010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1e48d53ef3b0ac59644847dcd2b9308eb3a970cb717034fb339f8486ab6ee3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOHEK1802010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a47735c4b245a31456ee16a6d3996592cae1ca09deccb5c9703e250938a679. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T10:10:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOHEK1315040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bd91c06ed9bc65be6cb7e9cdf2f9793d612025d8dc9204994fd1b535839135. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430f0ebf4859d2f40c4ce36d88493486aa600d8d1538e881f625dfe8fb7fce8d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bb3ee7dedf0ae781c5e36827989e2576014b8fbd0e844523ae9cb1bb544ad0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6819bdf49bd9e92d45c7125a3d57ad93113354fec6268700f4c4f4ba456ece07. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dfe0d97c3ec8a0b5fea01c837f951add17d346bcdce4d5d45e1af0d10eee5a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9e9d2a5fa89559baa0732f8c5bc1d58e5d267fff4c4977ce846e716504c146. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f963a03dd1dfb4d354a5aafe838f67c06846ae4ba1eda3a719535a3427fb02c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ea81056fca8aeb444eca698086b1c98dbe8d652a796078f58cc22a522ccbd4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06765c3134cdf779bc1bfde21b4c30ec5813133f44e55313b961180548a2d414. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f2a985d346cedb01a0cca10b8352f15edb2f64042679153aea0c4424917246. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4a98ad01843c507d7d7271b2aaceb8d22c97e3eb1dbeee7e6ea71e2088a62d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7eb21018fd744127ec406398a9ff50fe6fd0ce43d4a13c6bead80021536f8b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800193.
Sign. Karlsson - Evig vår, Helga Andersson - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da1a16b5e1c05564119f72bce172da883da04cf8037cc8723a0e389c13b0f4d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6942b09700161bdf439b224545bb45d3b9b434331ee42fd66c574c74273e70c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d8d749f3b7b38b8c703eb9805fca823164ea5e21469c944f8abba327856b23. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPQA1800197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fe8fcf374ca7f413879cbaa9b79df6d471eaf28076efa1940248f6ffc8df1d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFGG4101010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31f9c5678f4e093826019781c3d0e78eb205009d7d36e967543ae13dfa24948. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEBFO7504040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c84aa7e687116ea76914a618e5cb9690737a15799ec46970617fa1985ce7bfa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEBFO8208030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d99a961a90fa85d53ffec0fb0008e495709b25f1e3ae819da80cfadd018563. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOBJL9901060.
Vila vid denna källa - Fredmans Epistel N:o 82
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb60304b7a058c1aa0ee5b94cdd7a7434fbc3f0cc79553899cdaa1259b9b06e5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOBJL9901130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519dff0011d4b2bbc6b62fb5ebc2fc5e0d2ce84575e4c15dda54f786884f1fb2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPH0901520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000a99375aefdcb3f2dbdad84634b9890b0c61f3a77ea2095daf70a01466fad5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1435580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab198325847ce9a9a0419a37ed08ce62b7ff73c75ee94aa618dbb8181ef5dac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1435582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04ff4fb6cc0577dd6fc839ac2947abac43b26121d83be6ddf44f8e0291a592d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1435583.