right|thumb|250px|Former Ampex headquarters on Broadway in Redwood City, California Ampex Data Systems Corporation is an American electronics company founded in 1944 by Alexander M. Poniatoff as a sp
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8405f41b1777e01dc55b0eddc26a1897ccb3e80025aea7d570a85722da801a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/646202dc-8386-49d2-ba63-7fc40270ef78.json and https://artists.proofprofile.net/proofs/artist/646202dc-8386-49d2-ba63-7fc40270ef78.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c61ad9e0cca73cea141b76e63c0af8bb3d4a1a32e0173b6d4ba5c5abf723c5. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/DEZ902000262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7392fe701994a84594a7d142903d8c0e5c60eb6d4ab07505f14fe4f50edb59f3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEZ902000438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b63633658b49720a6227fe3c270bc0c423ac7f3aa0f094374c8ee8698da9437. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEZ902000428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b520649a265f3aaa400593b1fc0760d635d9832a0004e564d4f4764e51f01a. 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/DEZ902000433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fd524f73eed5d3398a361e424d2b247079d70e38da248f6619dabf31d81d9c. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-17T03:04:42Z), 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/DEZ902000437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc91bcd9593b0c2d9c4078386492fde075f77ede4214bc299dda83bfb06f16c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DEZ902100458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf24b61a9eb32e8ec08312f4c40424ad8ef709549f03abd52c9f950a77d2aaab. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEZ902100457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eeeb7d31f344afdd1b1b38f86ea2f96d7227f2cfc7b461f481dff35375d6372. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEZ902100461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ab6238cca5beff630f4c2e5050ce5b2fd35c65315abaadc1f63bf9e4ba4269. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/DEZ902100465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c862400126aaf3bc27ef0401a25ed7e415f351ae032b0b3e687ed976639599. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/DEZ902100466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f077dab3ad71c7167ec7dd17441d895fd6185ad6c7251a57ab62258d5cab6e. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DEZ902100467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc97b066f1e537848bad5e2d14cb4a01053cac96d66cf70eef68829f0fd9883e. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:52:23Z), 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/DEZ902100468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699f1c5875f020a823266603b464a506e9edbf7181aef06cf3e3f840654e1e00. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DES372301127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc8f968c12e2c3f5c8ebb16690db32d48c399c713f25c135a271cfd8e7f304f. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DES372301130.