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 0x9dd3d481221323fd96c8f3a47f83b9e5a0a8ec8a4fe0b33670741e0bd7bb4ece. 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/5a089f64-13ee-4dae-93a2-4738a33561b2.json and https://artists.proofprofile.net/proofs/artist/5a089f64-13ee-4dae-93a2-4738a33561b2.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 0x31b07338a0dbfbf0ac078c4a5fb703235788cedda8038c24ab0c6c49565c17d5. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:25:39Z), 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/QZK6J2181855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92bef2262715dbfa4de5fde0baf2fccb0168ce42d7b015b8659ea78305810c98. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZMEP2130648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03d97f88ad939aabcddf40a69207231d62a75bd78e15ebfba9ec6e14aad02a5. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZMEP2130649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7bb12fa8ec2c3b5f787e4f00e6f016e142844168d3d3629cf6e0ad4a9adef9. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZMEP2130652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00209ad36bcefaef1e3f474d1225d592390749bc204b51171647bae944eab5e6. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNWV2184774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0091572b4b62b3f6f41f6cbe16eab0e32ceba69cd315d0ce078f70fc9a36ad54. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZNWS2095306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f45530b949df1941a4d3cb71b41b14d1c0a1b529fdd7573351070cc0db02852. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZMEQ2371645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ead49d1bbd41d5b490ac97ed75966f37c931d3aba081ee75f1c4e37d79a4983. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/HUA612401992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e022c2bc0be8932946437486d46c4909ed16de784d26185278f08fd07611b33. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/HUA612405373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6d4cee3ac7b8f2050e77f07367bda8b1581e50cdd702472a566fe0c3102307. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:03:51Z), 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/HUA612500269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f873c828d4b64c0f168e27428271496a58dad4d5204d1dd1915d1c6a756558. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/HUA612500370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41800580d8e3c9f3b79019b599c90a3efff6cd7df10d59eafcdad2619b4cb575. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/HUA612503523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66763de3b5e7613e4057bff04f3352f340d88b51eab43feeb54ba8738b1266c4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HUUM72200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198103887cc15e84eb58721707b94f6bbf9d5a952bacfbe3ee2e347527bbc1db. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HUA612302524.