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 0xec400fe423f52c25321046ab57faf4ba880b19e2dde4a212bec2a3b64e548919. 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/ff9c6942-2f1c-45c3-bcda-0b8be1d76cb5.json and https://artists.proofprofile.net/proofs/artist/ff9c6942-2f1c-45c3-bcda-0b8be1d76cb5.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 0x7fedac0c6a27c9766d507da94ebb13e5a55350ff3f71c4ffda47d5efb6925f5a. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/NLHR51126228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac91b1889fa9a7796696c06c069fef90a4a507f5b11e5a4acb913165c63649f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLRU91111001.
Ze Hoort Bij Mij (Titelsong Sneeuwwitje)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8eb53273ff2a64a27a0a6fae1bc87505da658a89aeb30697622b5f352a984a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/NLRU91111007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a4d9fadbd27391441f22829abdb61669b36166a649f7cb61e586732dd717d6. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/NLRU91315001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a95ac32ac3705342407bd1aaeec1f8306ee2ec718fad03962e10bdd96a37ef3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLRU91414001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce76872d4659e3498b1d8734754356105f8c21410b685ee1725e2cf3a7af9d4. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/NLRU91625025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db344c60e6b6b0707aaedd8d00d554bd2063868260f9ac2dfb2ffe74d54d07a. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/NLRU91821002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba91d16f598e28cf387211cbe54d6da139f7544f684919a73a99e7707fc7467f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLRU91921003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c450e1d5dd0260278fd3a4ad99fbb956cff7d0ca61e24f84b9b829a9e2bd8ed. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/NLRU91921051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0966cf70530d0b59f3aaea084901638abe3f370e06faadafefbc0537672bb0. 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/NL3GQ2000074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949402d78665a6bdb834c9654bb6ca311168d7a71b3f9e4acafee6633c6b6597. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLRU91725028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a7cd086c5e36e3b89b5130a9fb4f5433ebfd3ba3d1a552dc4c2085af3b95f3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES52152904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f2928cb95a1cbef1cabe9ccc1ddd043c893222dd7522153a182bcf35030a58. 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/NLG661900379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cc58b8472ca6f8404a5ae79e800afd187f1680c84857a56772b777cac2b0c9. 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/NLG661800602.