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 0x485f23491a8e443abb98d65f5094bd24960ef9b166f46a5fe87219e75f5cbfcf. 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/5bb0c4ac-0a74-4873-8e10-8b4912cf44a1.json and https://artists.proofprofile.net/proofs/artist/5bb0c4ac-0a74-4873-8e10-8b4912cf44a1.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 0x1e07aa22a5ba012f0a4ca3a4cd63540752583b2fa70f38af7ec489e57ca7ef7c. 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/QM6MZ1957292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c97d24419d596522b1522867b85cd77a19788778331c3e6e492971c07dbd5b2. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/FR59R1909647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb76c9be29481d0e1a04f562aa16544c03a1a14447e32f69f90a7b565c7f78fa. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/FR96X1934302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1c01b93dadfe602eb5e347fa1dcdca315cf995216dfc44181e62d68afb4c50. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/RUA012000593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd15bfc5b78d84160c877e7394809024bf3bbcb53a193fbe6e06e678c847aed2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/RUA012000552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa893728fa3d354a7da0c1b9f801a4c2ac4cc7d060554d94b5b21e1764664acb1. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FR2X42214910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b90c52c94570d36ba39dded2bb57fd2a91cc04a3ba9ec715158c794d9a92ca. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/FR2X42214912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9318ed5c6e4b7f0517a5abc321b73a7fc5b9ea5a5223c9120c8cbb4736f55c8. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/FR2X42214917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116818660327f621efb3a8dcca56642443d1a30f2ea8590c5ed2dcabcbb08233. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/FR2X42214919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3335c29322409b347db96f49aadd1ab4458b334951442110521e689b8d3894. 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/FRX762292709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd83967df3b7e41bd2563ba02f6232770d837c8d17115b750c9b5f3b695dc9b. 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/DGA082356391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb823d61dc67519dd04f024afc8ae650745dcf83697078b11ac3469a5640abf75. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/FR2X42463555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d0bc2a5626c630267b32a64ba3e608bf671518a6a1abe77fa538d19a57211f. 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/DGA0R2452024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422b8dbbe831492914e69953d3e025b223057d379f6e406f24af4af399d64ee3. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/DGA0R2452026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec420851d1fc75077d4b2d44c92fdc14530ca02a19e9db32e74432006c6ce957. 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/DGA0R2452027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01790cd7d0057e85759dc1352ffb287c63b572fc3c1df6d0c76f0ac5ca9960ae. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DGA0R2452029.