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 0xca1526cba8350036b269c0e7c9e3b901fc80c6b593607a7d1f6d86673817afdf. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cf0f14d-6d30-45fb-b19c-7274c6d345da.json and https://artists.proofprofile.net/proofs/artist/7cf0f14d-6d30-45fb-b19c-7274c6d345da.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 0xed1fa969932a394d4e364cdebc22096fbf047e560d3ee97867a24733d4c2f5d0. 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/NLCK42415435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09668391d357f7006271d2be01dd08fc785155f26864b4a7d29f2cf303b095d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NLCK42415436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b91ba3af77938fafdb2a4291ed0b5af9db3fcd3e7f50874acf14bc4c4be2a9. 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/NLCK42415437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2b842dc395cd840c2359af41cb92fcf708270a84a6446d81afaadc9ed1b6eb. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLCK42415438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6417d86c01ba6debf2e24e9be9e23d4c6103b04ade557f8eda88021b3bd0c703. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/NLCK42415439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669405fd39928382ac7374eb592047ab4874dbd4c39bd7c9e9c3770cdaa957c6. 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/NLCK42415441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf694afeb71b2fdcba673c6fa11923e378ce2bbcd955aaa1dee1d978831909058. 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/NLCK42415442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a7293cf4268f02f84aa449bb8185dad04f03038b638ff3308335830d580cfe. 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/NLCK42415443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dac669743f0dc7e80510a653cfc1b0243df5a8eeeda1f324814490d9464ecd4. 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/NLCK42415444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9e42d8c6e766d20de1fd516cc8547f67f8cded52fd641330b0c6d0b575acae. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK42414976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e1382862618eaf51a809aea49f6528c182194808ebc839426ff35e8c9ba44c. 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/NLCK42414977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69091bb2e5ab1e205adf6fc9685da9bc1b14310346cafeb1e507ac55a580e261. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLCK42414978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6180a0b6a24b0573e9a4c373193601f8591369bb6424037ef42c45a8432da1. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/NLCK42414979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6818684773fc669f65c4f5bce48bdfa1a3824345e247b0626265524b354a5152. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLCK42414980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe48f4763cda197eea649802dcd6eb8c90172aadb4795d1f6e918c1683fc0e9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK42414981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a5b62866f0847ec49b11bbe248d5c0277ea9c6d48739533ec5ca7475828c16. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/NLCK42414982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa76c1ecc6d4aad8024e56648cee4930cdc50c71edb470efdd5338bb9d53e2f6. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/NLCK42414983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cd67938ce5fe6d380e16fb3d4f791a28756d39e4c0945afa4059c21c0e2c3f. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLCK42414984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe532511597a3e17ae04752a8019cdaa3c5389ea410f7e8710eef9345bda72427. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/NLCK42414985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ee4460b247d9ec1807418fb7b70357814b5c04a061d1f43c619e2e58951147. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK42415478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35740eb6e71da5af1b57c529b6f8f9991043cac904362ad63eeb9952168a274. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK42415480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76347071a84ac4ca5bf70e26f680b199b588586c94cf1944dc4eccf3245e1066. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK42415486.