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 0xc0b37b619188b3df18b286093c338bea29c4d6537ece04582a975f2ca607ee90. 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/f9a7dd54-c85c-4271-82cd-cf21f7cdd2fb.json and https://artists.proofprofile.net/proofs/artist/f9a7dd54-c85c-4271-82cd-cf21f7cdd2fb.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 0xf55d7a8f03e68d9551e6f4b40a78e899e4cc6ff522d7d8c889808d6565444a38. 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/6ajnvRkOCSBZ7hhMGq45g8.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/6ajnvRkOCSBZ7hhMGq45g8.
Beste Zangers Seizoen 2021 (Aflevering 7 - Anneke Van Giersbergen)
Beste Zangers Seizoen 2021 (Aflevering 4 - Alides Hidding)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cfc103e90e5a3aeda7a8ef710037be2fc1fffdb8f817f20f4dc371a966dfce. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2Ga6auB0m03aMZvXPLrHnJ.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/2Ga6auB0m03aMZvXPLrHnJ.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3508e9e2e9065ed9f45da98b70c3a9d49a1ac992d4883c9b322a61aa936ac897. 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/2SXs2u6WcrGWQnww5J3DMO.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/2SXs2u6WcrGWQnww5J3DMO.
{"copyright_id":"0x5c4b808d59683ccafdb524cc971c83fa4566015f0264bb4f15430b321170d4f0","isrc":"NLSU32100024","name":"Nothing Really Matters","registered_at":"2026-06-07T20:38:41Z","spotify_id":"6BXlWc3RcicvDzjrNemdOw","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4b808d59683ccafdb524cc971c83fa4566015f0264bb4f15430b321170d4f0. 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/6BXlWc3RcicvDzjrNemdOw.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/6BXlWc3RcicvDzjrNemdOw.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37e4d23fdd92f858be38e30057929449df080d44968e8f22c149d6ed70c8314. 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/2KmSQ6q4XNvX3Aj8T2P3h6.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/2KmSQ6q4XNvX3Aj8T2P3h6.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bdc3f34f83b5f10c554990914ca10102775509972f2409bc2e08e4cc6357b6. 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/5ca446tedOj5ggANgq6186.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/5ca446tedOj5ggANgq6186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0552761b0414b28711993deedd1da1c349607eda4d77b564dc48c89f9e6f50f6. 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/0HINkctZ66GaQotJgbyCcd.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/0HINkctZ66GaQotJgbyCcd.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f86ebb6a9573d498e70e28f42f8fa0f0fa9542e10658601aa5d50bde1458984. 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/79xFj4P9tCUafficzbIXTH.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/79xFj4P9tCUafficzbIXTH.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cfc103e90e5a3aeda7a8ef710037be2fc1fffdb8f817f20f4dc371a966dfce. 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/3URxBp3v6I70GX3xDWzV61.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/3URxBp3v6I70GX3xDWzV61.
Beste Zangers Seizoen 2021 (Aflevering 8 - Duetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cfc103e90e5a3aeda7a8ef710037be2fc1fffdb8f817f20f4dc371a966dfce. 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/0UO8I3fP1cuMHx617FYv6a.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/0UO8I3fP1cuMHx617FYv6a.
Beste Zangers Seizoen 2021 (Aflevering 6 - Joe Buck)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0552761b0414b28711993deedd1da1c349607eda4d77b564dc48c89f9e6f50f6. 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/0WwpKcAkqJ20reL5eLD9rX.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/0WwpKcAkqJ20reL5eLD9rX.
Beste Zangers Seizoen 2021 (Aflevering 1 - VanVelzen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3508e9e2e9065ed9f45da98b70c3a9d49a1ac992d4883c9b322a61aa936ac897. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/5Iy1Ch05thv7NogNKTPGhQ.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/5Iy1Ch05thv7NogNKTPGhQ.
Beste Zangers Seizoen 2021 (Aflevering 3 - Belle Perez)
{"copyright_id":"0x5c4b808d59683ccafdb524cc971c83fa4566015f0264bb4f15430b321170d4f0","isrc":"NLSU32100024","name":"Nothing Really Matters","registered_at":"2026-06-07T20:38:41Z","spotify_id":"1UoLTL2I3mrcdrUssAZvSX","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4b808d59683ccafdb524cc971c83fa4566015f0264bb4f15430b321170d4f0. 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/1UoLTL2I3mrcdrUssAZvSX.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/1UoLTL2I3mrcdrUssAZvSX.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3508e9e2e9065ed9f45da98b70c3a9d49a1ac992d4883c9b322a61aa936ac897. 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/6a5uHJTUoTZ0ye99FhRZQV.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/6a5uHJTUoTZ0ye99FhRZQV.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4b808d59683ccafdb524cc971c83fa4566015f0264bb4f15430b321170d4f0. 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/5iwbTVNHy2P3N1V9BuSoRU.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/5iwbTVNHy2P3N1V9BuSoRU.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bdc3f34f83b5f10c554990914ca10102775509972f2409bc2e08e4cc6357b6. 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/3AwxXQ5puUnkEGpRAfusLw.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/3AwxXQ5puUnkEGpRAfusLw.