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 0xe15451f5075f87eb652e7e123d1fa42ac46a849385d99f1baaab32a76b78a794. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bb6c08d-0f37-43b6-84f5-2370c040de42.json and https://artists.proofprofile.net/proofs/artist/0bb6c08d-0f37-43b6-84f5-2370c040de42.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 0x8d7648bb08cd0c7a0ce5a737c9774bfbc3a8abc005e6f3e36522873ec6ecc3c4. 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/QZFZ22166806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee9874b964228040ad05087de85dbe4fa9c78fa0dfe76c86d1c92c8470ab75c. 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/QZFZ22166807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdf756f1ad23f42a946dcb488e400ecfc3e0637df3ed065bd345990095e0b69. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZFZ22166811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1db1d1af00f4203b7339a5cf26827bdb41b334e57377e8bca5428d848e21638. 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/QZFZ22166812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae6d60a1e55fb0bd554d2a25b1204cd9d64caefb4c661e21680a1fc6da5b54f. 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/QZFZ22166813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996b080e394211e6d7441a5a2d0f38ee59e6985f96bce6412b5ba6b8d96e2acb. 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/QZFZ32347446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33112da9682d8d0fc036eddef7e822c3e2049c197da4eef653ae5c7b98a2556. 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/QZFZ62297946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2137dfe3c0ab522984e146377d9800d02880807a9ea1160265b5be00865b8c7. 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/QZNWX2138253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e60343c29a169924359a164ae136f9a6e1c06c158a8e525421114a78c2e940. 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/QZNWY2022702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97498134bc5906aff6bde39a5f132e43f075e5e0ae06a4eaba1cf05f33ea17ca. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/QZMEQ2024241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7255ac468644db10b94d717e84cb3628cf5538f23bf1acb01b4680579d07dea. 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/QZK6Q2022370.