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 0x8b3cf708c1934e6cc3885ff8807eeb2206acfd5f9535df3d331df23b08831159. 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/58c4b826-85ad-4525-aacf-24aa92b86050.json and https://artists.proofprofile.net/proofs/artist/58c4b826-85ad-4525-aacf-24aa92b86050.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 0xbeae27bd7a98c87cf5afd07352e3e50a2c99b72678757e078fa344d9521ebacb. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/US3DF2014765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcfda34eb2be878055c05d453bb3bc1003bfe8445b943df2a3d9175b8858c3a. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/US3DF2014767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3bf8728adfa121ca83d4fe6a03e27483125e14f61be06f8c6237a73ebcf25e1. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USANG2131849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d30a8b1699369880fbcc2b49b7b798cd33cd1daa706b8a3b5ab328d67884c2. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USANG2152334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b12859dfbdaf1c82ddc94ce1d6071377433c6224952303e30092b1128994a0d. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USANG2149680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406ad4d639894d9931e0e4fd89cca306b8f0f010c0a1398cfe339c2c716696db. 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/USANG2149682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd071e2ddfd699519ba76291ac356e098ddb2ce3c469c3757e35c497ce7b5fa6d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USANG2151027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3460c33d92fefef64c52b1db76f504355a73fc4541aa96342d0a61f9ad5faac. 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/USANG2152317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe602c8f84b64c5daf5019d2ac6a46e46f8a083fd9eac1f298486c529edcf5aa5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USANG2152332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6007542ea9eee945f96ba32f6f8096fa24d74d77c33720c3933f565daaa5d2. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/USANG2198261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707345b4fd7b2ebb260be48b154f5b68ad0c29c84e022ca85a05386d357a1e7b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USANG2289908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cce41c3dd4c062ada31801697d77fb29915245badd7130f34a985cb624fbc7. 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/USANG2289915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6c8a12b9b4f3b26989cd89cf1a8a5bfe940cf2e04615ff51fd659e9756c265. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USANG2289919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecb7a99584a6d956f84a6e4347bd14e5e211fc50b4ec12d668ecc190566e517. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USANG2289924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93df7c69368688f3ce34a85df5176981b54912a852e55b592368a58ae8282174. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/USANG2290018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c29a30a2bdea7808ad71545de4674bb1fb850a26d162397bda636289b464f0c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US3DF2282842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5ff66d6bc372b5cd50699fec6fc9cd5f0667feef3b93cb7f2e44a44324bec7. 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/USANG2193320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb1ec743e963973d0f67fb65b7c94b98deda79edaed225fa37a7b7db5ba077a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USANG2178453.