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 0x555f63572f6820d86b5e359b883dbca687ec68e0dbb4f8f5f2bf7fe42b2f1125. 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/999c370f-49b1-43a9-8a54-70422644b447.json and https://artists.proofprofile.net/proofs/artist/999c370f-49b1-43a9-8a54-70422644b447.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 0xb6456d22b073c970cb0e2efd34fd9afff5a8aa45f56f4998be48b19e4c6b6156. 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/QZNMT2104938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d9a01d05b4f726d7a4916cb914842a1a34ec704f275a26537936ac9920d553. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZNMY2187890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd8d01d0139cd1405eb51dd0abef6772eef3d81cdc7398ec8e258619386c1a2. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZLL92349469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd92bab06c772f270e17747b8377983532eddc90d00e8fd8be6c2211f32af21. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZLL92349470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f04466aa86d6a77b0c4f36fadc15b3775a2f8f267e884dd8320eab188bf84e. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:41:42Z), 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/QZLL92349471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba28780b1b95cd8be15735833fc6f64f23abaa2a6babfc61fdddbb36e0fd668b. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZMWW2333603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaff05678c0ab27ac8fa0a12ef2a52dd23f3189ac74b13cd8f1339b74b810e41. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:41:25Z), 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/QZJG52529997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b77502cb629b3ec3d5b7111d690f42ef7a03f08d9cf1294d4733c0f0960bf9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZL382502510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2bbb57c20400279698dce311ad28f49c223a7e14b9e4d3d9afec6ed320ad9d. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:31:39Z), 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/QZL382558809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb23e234d4e71e5db65630bd24da832100de9c33ca96e59417f41b391322e776. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZL382592947.