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 0x4642d90f71a5e32ed4626e0697ff6586807795bd496a68bafd6a3ab200063007. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9f2dd2f-f7a3-4ae6-8b62-beba4fbedf51.json and https://artists.proofprofile.net/proofs/artist/e9f2dd2f-f7a3-4ae6-8b62-beba4fbedf51.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xb1ce21762294893982c3ad8cb33419c650c6be3ce8ca29d65a44cc5ed6d642f5. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FIRCR2100051.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e81cd29e001b0c64e70d743006912cd65b54e732efe42b380de334761cd337. 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/FIRCR2100077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c53270e3fb0b6970010004d0edc220fe7b78bc880af9e94818b1ada53c16eff. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FIABA9300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37e146f873ce9523ff9080e1e7fc29ad2f602dcfa78047fd393d923008f0a7f. 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/FIABA9300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f175e8a3d211c09f8770138e209da4064c14d1c0c044f181c129e6243baafd. 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/FIABA9300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b94596fb21694aec2ddc0e81b45c19c756a3edf9b7402305425ff24252d87c. 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/FIABA9300105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05faab8e9b0ca1d70f99cad8fe835705630d5979fa054589f353abce85b9789. 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/FIABA9300106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb81b65212d78b9785b5bac616171ab1bdd3464885ef8274380d43c4381885a. 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/FIABA9300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813ef06ef457b072c75b9407f22b055eeda2e19870658c4f5ef13b32e09e1c63. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FIABA9300109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37a5ce1a8f28c5801e79fa77e42979103d8a23c27a45dd8b4cc87eb1ad55c5f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FIABA9300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee00af94903f8f89d9045b802ed78fd0c3db65483e9f1ba5d40ed06390be9619. 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/FIABA9300111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6d5fad83f6ba39bc6153dad676d48178150790edf574157c7c0f2444db560d. 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/FIABA9300113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88986593d978363ebbb460bf0fc777402269a62b3d5cd17d58688ef6a439d5b6. 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/FIABA9300114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6801833c1a5e374f6c4dfc75aec16e016d5bd652f5182bf2f44d381c7d8603. 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/FIABA9300115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3daa3fba19c39d6ea8572770a6f2677f417ef35dfd273674f6cdae65336d019. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FIABA9300116.