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 0x0b96394b526df7f3009ea06e723860f39dd881a8e8fed507fcfb6b969f5dbc45. 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/9b74e181-be76-4593-8a56-32110708b021.json and https://artists.proofprofile.net/proofs/artist/9b74e181-be76-4593-8a56-32110708b021.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 0x820a544283057ce1facd770ab8601c42c272eb331ca14fcf1e97c17c7d1acaa6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/UKXN21957805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39e38f2122cadbfb62da3808c3cdb96e034d63e0cab57c8822e3f70e437ea8c. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZNWV2076134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d53ee3528cd2b5e1665ab08aa8a7d6fee0595d81d35a848992297204e37bf4. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZNWV2076135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76350a1102f7893fce9ef8edce8100a5ba86f35f1bcca8113b05175db84ddd24. 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/QZNWV2076137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8169cd636a296231a4e056bc9db114dc65133f70482aba65178b5864f2513e9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/UKXN22014793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc690e90066e952519bc721cfdbda98a047411c3e7efc19ad928affc9ad461dc8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWV2076138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a4880a08991629dbc36b0154c45ef6334c91db8c3adbcd075e8813803128bf. 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/QZHN72123468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953b980a0554b0bec3ecd5b87ee67e68c98f2fdf7762f8b70cb3f5b59e817284. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN62215662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e917e145d6212026b0ed4dd4ea8b9f8bff017dc77cfd4f0aba67ca36c0ebb9. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTB52262293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7652f389efd3bcc12b70eacce71837cc5a8a627b8f1270d381b65fb9ce5ac84. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TCAIU2460155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8954807caedac8648e35e07b14d7c7011d396bea1af6652e86258cc158f83e. 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/TCAIV2479116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4acab004968a6c91ff457844cfac6073df6de94cfa9aa0db06b4fb227f08bf4. 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/TCAIU2479323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bded58569c2e4c2975f317ec6f922ca60d7e16f474bc10fc7de05603295db2b. 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/TCAIU2479334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cdde975a796477c21cdb8b00c8100c72f04e7f28f7a94e604eb712c8a20ac87. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/TCAIY2461284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acfbf121d48a31cb8890877b7b89bfb84afa7a565cd593b92f8ba4cacde8354. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAIY2461299.