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 0xd3c766292d54c863486948149b83fe0a73606a723ad1d97711c76a2f28de29a1. 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/d5e05237-18b2-4f87-9cc8-5602027002bb.json and https://artists.proofprofile.net/proofs/artist/d5e05237-18b2-4f87-9cc8-5602027002bb.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 0x225cf5df1534963550072589a2a546dd702b1131948c05452988642671377eca. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL1GQ1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb22a2bf50877fc0dfca54e217c964afbe41eb7451a51498edc5ad58dc289576. 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/NLL6R1900219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd42b7ea632dd668e105505e780d96c31eaf7cea7d2da3e66f12fe3bbee09499. 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/NLL6R1900220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8f4a941343aa2a879b30c0107bf753a99d9f74697ee5dbfd99025e976e0224. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/NLL6R1901178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b6dcde2257c62bce168dc260cebfeb1c2f6eba3f33243bf9cb421e1fc2e9d9. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/NLL6R2100144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0618bdc224c1948c02b17c8c7038a6366abf56a2c6cc5b1bdbf4e2e5bdb13b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLL6R2101058.
Zieke Flitsen (feat. Major Dreamin' & Vlamingo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881cd0ff9a5ae13ee7ecaa751a6274ebc3434b4c266cb924c068e859d051ff80. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/NL7GJ2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0251bc96a3fa9bdd3bfe2710348e72831970d7e0bdd2fb07c0ec9d25938485c4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NL7GJ2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1cf74e11f185a836112a3b248070bede7fa1115d645f24f72616e5b2da2359. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/NL7GJ2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c24e78960f4a8103e1550b4ac6d65bc1f574d9273ea2be1022c4f8bd97bb05. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL5HJ2300243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa96e31c6edf95379f5f6a8c8c1c8ba52249c91dd4e43f8d22d86428938f6abd. 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/NL7GJ2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c265249184b74995743be92bfc4eb7edec58b4ffc34d242dc4c5d61cb5da473. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL7GJ2400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183ab9ed3779620c61a8d6b023935f5f400a3f7e88b1a07b57eabedcc9e581bf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NL7GJ2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb221e25541a7c10bde3a0eab9d2528da77a1a2d31b2c5f8423132daa9e099cc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NL7GJ2500005.
Vliegtuigstand (Waailand Outdoor Anthem)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dba7d724b618d852d16bb196123ca27d8b1ea6e794d7d5e620ac655b64d527e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:53:50Z), 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/NL2GD2000009.