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 0x33cb3305a232c9851b7cc479c84e61442a7fb1746d62e7d1efbdb317e6a3e6c8. Chain 2 (Bitcoin): anchored in block 953638 (2026-06-14T13:10:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/397d8784-ef7e-4325-8b2c-1290ed63d0bb.json and https://artists.proofprofile.net/proofs/artist/397d8784-ef7e-4325-8b2c-1290ed63d0bb.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 0xaf5d3acd51a6d4912e8c50993ccc8cd0ff58b0abbbe555add7b7df1792a28e69. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USHM21690550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170e3cc0b54375fb6e90ab852340035e754fd96f1662694394d571a2edbcfa09. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USHM21690560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a59599fc7584cd6d7e621589f38b4e170390cbc0938a7306438ea93f89da5b. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NOBFJ1501050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb4e71234a90cc51803897bde8a7c5a0c8e5380757ac372d57d0f54025b1044. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NOBFJ1501110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fe6c53ae5d02e4a842849c8b085d6d52b6690930feb16aa0f077e7f84df525. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/NOBFJ1501180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db7331613bce7eb6a49c582750497fbf06ec59c7f68bee09cab40300500106f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NOBFJ2001010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d62ade654adf5fa982ade19778c1916e6e83826d8ac0e72fb8b9dcc9202a1ff. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NOBFJ2001020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df1429b6f611b2aaecbe1618e126d14282f9100680bc988e64c5d94267fe61e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NOBFJ2001030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e811d6d201d70ea581dd9bff9c02be52a4ea55e5c0948882d8bb6364471763. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/NOBFJ2001040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7586bf8933b888605463265f275817d8dd7e80c245d1af37ef42dda1dfa5e6e. 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/NOBFJ2001050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2173b84c621a0bfb56187632fd51ce04683d4b28a707221861e60933a6fc63ff. 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/NOBFJ2001060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57f040d665ab5068e8b01e70246afa29cb5538e9215987ef1591eb9cf994a57. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NOBFJ2001070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f7211d592ea109d20f1373579d15b701460b180d1f0e7d5bf7dcca9a1800a4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOBFJ2001080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1338d846827b3ead58c491b0a6b52010e3f86a1bbbfe2c2f750de49451ccbd. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NOBFJ2001090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d8f516edfefaf623225aa63ec3cc1f207fd40e177e45a0cfbf393c218c7336. 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/NOBFJ2001100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93482ad03fb72325864a212297837173e45a1ed7d30ed5132e81c4a82890775a. 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/NOBFJ2001110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24bfa2e32fd6bb16c143fb4647871e2fd7f5425afb0681f9c9dc169d526c2b94. 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/NOBFJ2002080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326e97d8b20b6a79894e1d76f2ca8619fa1881a9e34988f03525048fb62588e7. 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/NOBFJ2002090.
What shall we do with the drunken sailor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e9208ab4a4b09b562a1c5db0896a668207059cfc946472ec3b5d72d08b5bf9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NOBFJ2002110.
Hem'att tel jul (Arr. for Choir by Kjetil Bjerkestrand)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c35966c65728d9fdc6df40990e8fd84139ddb6137d3ce4629e1fcb3467026e. 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/NO2J82305080.
Nordnorsk julesalme (Arr. for Choir by Magnus Klokk Fremstad)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3b47974fa54b203d27d6371a3fbedaf16c12cbddc234b8b2b8c55fbc215f61. 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/NO2J82305130.