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 0xa0d4590edf57b4f353a42bf7e13a20c73f2460a1f94b59a0c97a66063726c4fa. 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/0ceabf97-1808-4992-a5d1-25b4f8782cec.json and https://artists.proofprofile.net/proofs/artist/0ceabf97-1808-4992-a5d1-25b4f8782cec.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 0x86a1f6aa7e18c47a207704027d018afa680c302cd84e0f064760f3f17a881eea. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/HUB161113147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3ae4e7c7d27d911bc5818230adc8b760d9e64bb2a04939fa42a520020b36bc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/HUB161113148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad92617a194aa27badc7e81c479917bb39b187bc90aa827c2eb0898c3fa0c5f. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/HUB161113149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc9d26d7b3f75547491f17b8d5da9331096dd779eef049110c095b26ba942b6. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/HUB161113150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7397daed3f7512ed076a3b7829b3b30046cc4d2dc5439799f30e57aa8114d0d0. Chain 2 (Bitcoin): anchored in block 957688 (2026-07-12T09:52:21Z), 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/HUB161113152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5277936ed9f18095835b7b3702d34c966a0651f991477fc24e010df7217d96c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/HUB161113153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8557d8010b9ae39023a6abfb033af0e1a84c0fd2f0af0ca81f0167b7e83ec926. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/HUB161113156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8602c604098eabcbe220ac896a52df23431049159bdd80b4a673ac859efbc6. 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/HUB161113157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc08f8e94e82bd454902b8ba2ef32dc4a7f3a3db52902de3c76b001766a787e. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/HUB161113158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04efbf7a80d48b47ff94dd95aef5ff6b476c251535e11766a6b8bd2da0c34030. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/HUB161113160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaa5bbf2443a93025a95f89be4c36ab491aedea75e30932597f8bbf06166073. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-22T00:31:41Z), 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/HUB161113161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe516a568592e9990ad0346643379324f1e839bbccbc24ff85317b7b2f766a2f9. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/HUB161113162.