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 0x6638f5aab1c4d2a5fcdb50d52a4580b4003dfeef8f0188d8d0960334b4010b0e. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3eb894de-e37c-42a8-b73f-5ee0307ac6c7.json and https://artists.proofprofile.net/proofs/artist/3eb894de-e37c-42a8-b73f-5ee0307ac6c7.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 0x8669bc77ab85ed87b79ab47ead3849c5a07c2a9908213cfbfb35a13e0609de37. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/FRX872201691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608979523bee16fedba3ad1ba1e8faf8c9e7d8b82f928f007d9cf7c04ecc907e. 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/ROGRS2400375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12b8296417ab24885ecc3af9e22447afd19253ee3b8a9955d420913fa02af07. 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/ROGRS2400376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf2c745635769f5302b8a4330643dc242c69561dff771096a4921224619ec4d. 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/ROGRS2400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0df6603303eecc125936450a9dbce8b78a366b9da4bc84f968208dd1a505667. 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/ROGRS2400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c834750289ef47a84bdd64d57d96ed54e27f18f47619ee4acf53429bb917dc. 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/ROGRS2400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2badf67252523fa069dcb8c3e44fa7dc686c4682a0d8514369f6c9114d4c5d. 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/ROGRS2400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3422e1eebac6e6ecd5144cd1c53bc1f953927ed8759d3d164f6f13b446856b1. 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/ROGRS2400082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf73136e689cca37c27a852670f09ea817040e0fc208056d919ddc4d6a4fb128. 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/ROGRS2400386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b591d8fc5def897e64cf76ba7890a68490f720bade741ec8ea794793b08dc. 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/ROGRS2400387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23e2bdf26659116eb254022a5534e1a7d103cfde3438103a5fbeb10c3cad160. 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/DGA062475079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e689828737522fb21d4b3996a30f0669cf00c2dd51f3246f93553ed7923bde. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/DGA0P2456012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d86b174725447d6b7d7d2e139bea9a43a9918bcf53fa15a9308623cacf400c3. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/FR2X42598161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf918cf917fd707e3bc6e6c772077ec3a40d3fcc532351e50bf30d160fd6fb58a. 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/FRX282500071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5160bda81d5c8a57eac7a7ff770b85feea810824180b28d10ce7e5df6732a7f. 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/FRX452592779.