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 0x8fef7bcaad10ca33941dbff12aa5f506556d7cc74cbd855c07d4955acbcc839e. 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/9f950940-2117-42d8-86a0-d8e2f3bc6507.json and https://artists.proofprofile.net/proofs/artist/9f950940-2117-42d8-86a0-d8e2f3bc6507.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 0xfd40cb66e85e626a4ba48c8264e7f0a09828d94e01860be515b3a7ec42535d8b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAJG2516166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04fecfcb3c9108e4661141682d2f3a43266d358d5cb1642179c667ec97bf7c64. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCAIA2453222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd139c4c603b59fd6dc2f49e607718bfb8622bf98d61d180fb6a03955ab39cc64. 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/TCAHQ2387177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a9c459076049a98b6e5f8f83aba68aff92569d3b8eafddddd418d2f06aa919. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCAHP2364845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3056ebf04d400b0d1129d8eef27fa4d0dc40cf3a636bb8d13d6aa08eb275ca27. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAHN2360698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7e5259e34a364bd597c0d66c449ad63df4e5044d5e47c3f4823ca5ce5f2b38. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCAHK2339172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfc2da1cde7f8e384fbfc90f3b3e65d8847684e3f3ea72943820ce4eefbbe57. 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/TCAHJ2382152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bdd27070becfa8fa40f5edc78524f4374669f21d51944df875b7f3b42b00ce5. 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/TCAHI2349319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5990d210394e70799322a8943da54689c432abcf4056b13f1b5a88462e965327. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA2P2313826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89a9a9652a2b9cf3fbbd692264b8b7650cc60242c0e58a06bb7af0b5eaee7ad. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TCAHB2326005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834081c5fa3ade559062a48abf3addd275331efbffef942365d4176b67af8b9e. 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/TCAHB2326041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da2f9418d417ec8096ca07d56a1e3d19b6582f9e330aef5a5cc2e52bbabcfed. 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/TCAHB2326089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc229ef54ec9d7a57d973ee997e479d3287748ce307f5e5cc1d43433f8de4c815. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/TCAHB2326119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5dbfc3f6cc5f24f39fc037b5fa51d6299f128c11513fdda595bbe7fa89cc2f. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/TCAHB2326094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e037c6c31ae549d429d5d6be66c639b8ad123e56ace0a62e5be828c12cd6fbf. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/TCAGX2398437.