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 0xe34f7eed00b71481df091fed3ea7ae32583b6411e7ac0f64ca931eaa95715cc3. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af533063-25d0-4ad9-9471-36ab1da391c4.json and https://artists.proofprofile.net/proofs/artist/af533063-25d0-4ad9-9471-36ab1da391c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
O Heer, die onze vader zijt - Preludium & koraal
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 0x791022f17e036100584a621ee6fd02f5e9da4c97d821e6862266d50e3de79b45. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLG620594275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178413ae6564a1b6c6552d3a7e11c49171afd060735122f3b285472e18167822. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLG620594276.
Jezus ga ons voor;Heer wees mijn Gids - Praphrase
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81ebc70889947d7648cbf9501706e67320ed2b4b5f5fbfa23483af3f9fbb480. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/NLG620594277.
De Heer is God en niemand meer - Aria & koraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f40f0aa178e0a70a1d4ec39b42689ecb09e1543e243f42df4bfa94f7bd3372. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLG620594278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09cedc1593e5d8182da9c5d8a3f7adb64b8d9ca01b321cb72904e40cfde84eba. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLG620594279.
Machtig God, sterke Rots - Intro, koraal, fantasie, romance, coda & koraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b624749183b284cbbf4699ae4ea32c7e9fea5f8d39e26e89eb561f4c6ff9dd2. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLG620594280.
Grote God, wij loven U - Siciliano & koraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb0db706dec6e606b92682563a72f3fb3921782c60ea95cc10c5255c8fabadb. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLG620594281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233a6260c8b79a0ec92ff2300a37209773dfd80715725ebad399d642a6e23af7. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLG620594282.
Mijn Jezus, ik hou van U - Intro, koraal, scherzo & slotkoraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d728a979d81964a95c1f36094ead746b1c9d5e54833a854cca55000fb39bf0a. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/NLG620594283.
Wat de toekomst brenge mogen - Intro, koraal, preludium, interludium & koraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f17b9a30af900bb5065950afa35b77d3bfda836d41135993284e455d860b15. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NLG620594284.
Soms groet een licht van vreugde - Koraal, aria & slotkoraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd3e67a206743a5aa9da517a69d17fd37138e711fd8593432168dc98f108d54. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLG620594285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360d8f60d7924b0d52d9603a98c9e76bdc3e8e3be8d939192fe69c4893396f54. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLG620594286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6fe4b0ccc7f0b09b097a2abbf9d73402c909115de6b621de1f1bf4520a0052. 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/NLG620594287.
Heer, wees mijn Gids - Meditatie & koraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409a4f445f3aad9c0180769d793d68e0d382af93e3de908275f53961643ced8d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLG620594288.
Psalm 116 - Rondo, koraal, aria &slotkoraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa9fb27962cdfc88fbde93fb030d409c7ed47990d90bf1b1593fc84e2039c8a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLG620594289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7657fff3d7c68d5ec54f0ba8a4c98c70d919f12225149e3079ec09f5becb13f. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLG620594290.
Vaste Rots van mijn behoud - Rondo, preludium & koraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe762f9ba767f8fe247f0855a0cb16165a87dfa73e38d46c91c9af2c3d3499091. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NLG620594291.
Halleluja, eeuwig dank en ere - Preludium, koraal, interudium, prelude & slotkoraal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0621e14daa6480fc370ea32eafd741ea41b5c1cb21ecdf77ffb0bb06dff90ef9. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/NLG620594292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dd3b5417129e493a223d2eb6b02ab03dad60212e2cda5a76e953f78bc20eac. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLG620594293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1a1faea0f9f79d2ed4670f99c43d62843d55facdb533775f64845059059b93. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLG620594294.