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 0x65138a17d2aaae00a3aee4faef3f91c66b8c2da8d0ceb9b483d8e172d7cae674. 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/2ef0f037-1fc9-445e-a847-917bf3492303.json and https://artists.proofprofile.net/proofs/artist/2ef0f037-1fc9-445e-a847-917bf3492303.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 0xd3224af208b4022d306956e963a3491fc2d0b83e53556e2eeb2714f9c0d18069. 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/UKR6V2117581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe750b4f1edd8d0440ab76d81743c81b41fdc05f6d28a78f77656722f9958f8. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/UKR6V2210289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf194492121252fb67a0b3900fcf2bec020bf7bdf9f5c9e33d4ca9a220ffbc5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/UKR6V2211983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7837b5e17d812263efbae3b3daa9a648930e8c294bc83706147d699e8224c0da. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKR6V2272926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562e6f4f4534318a7f7ae1b06f360f0432da8f4d6e26686a2c60e40c368fd6e6. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZN882227967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb36e2e3319bef83b57d2da9c737f92e69bfe27fa4acb830fe167a6b963528b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/UKR6V2213393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a1cbffa6a14e10b504161d240ffacc7158a13d47fdca2e97bcf715ba95887f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/UKR6V2213394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e53641875ea2b7a586120c76471be16dbfad778600e9205d05a706045b4760. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/AUKDT2300555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bf30b90c230ad0ffc71327f9d297c5d9fcf5918fa14269415165c60c17e196. 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/AUKDT2300556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458e3fd2ae578d43312bbf3ecadabe13974176fbc96e39b0de7b5aef3b911291. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/UKZGC2407961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa5b11d55a1122d18142c9fc28e2f9ad4d1b238e01591676f3d4b3434a9c2df. 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/UKR6V2211866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490cbfa0d6c58a91c1d8447edd9c33cdd0aae11f286e77f74da47ac71da5166b. 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/UKR6V2212571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd551d3ea7e6c524eb6d460a64f707f28eab9ccc6644d2909b826e970ae2152d9. 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/GBRKQ2273675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832b3d7f92e493c327c0cf1cfc4556581f7ab0990fa3219b67f5082807698ddc. 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/UKR6V2211857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e133513eb10b80295634ef63a109b6e15821a07c6953b42ee43787ea6139ce. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/UKR6V2211858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4f08765930d8657c950766058429d036054e89d0d7a249a372b1ebfc8f8817. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/UKR6V2211859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801ffcdbb393864eecd905fd1b3f09fe423fe4d6421ebc0fb93c931026734836. 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/UKR6V2211860.