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 0x82b0044cc2d8ac308424b32a7ddbdc2161ee68c2cf620f8c08954df4ce699092. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce0b63da-1d15-4cd3-a4d3-6e18a7ca1642.json and https://artists.proofprofile.net/proofs/artist/ce0b63da-1d15-4cd3-a4d3-6e18a7ca1642.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 0xf327d0643d575f6e4f08d91afa16188226f750921021a5531071ffd29753eec6. 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/TCAHL2328745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d98dddb320332aebb9c6b260f9b45d33ee12772f23b1eeb94ce2efba17f5c12. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCAHL2328626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc90699d4826a893dd264b8d68de6577b6703259e5425cbb04049eb9e5e4055. 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/TCAHL2328709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d33df889853e7bcbde27cf23ec858b786ef05ce96d371690b7c322de9318253. 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/TCAHL2328655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8375e611ffc4eeadd41fe73a7618a61ceccb984764c4fdda4aacaef25235fc01. 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/TCAHL2328586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf327d0643d575f6e4f08d91afa16188226f750921021a5531071ffd29753eec6. 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/TCAHL2328745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc90699d4826a893dd264b8d68de6577b6703259e5425cbb04049eb9e5e4055. 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/TCAHL2328709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d33df889853e7bcbde27cf23ec858b786ef05ce96d371690b7c322de9318253. 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/TCAHL2328655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d98dddb320332aebb9c6b260f9b45d33ee12772f23b1eeb94ce2efba17f5c12. 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/TCAHL2328626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8375e611ffc4eeadd41fe73a7618a61ceccb984764c4fdda4aacaef25235fc01. 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/TCAHL2328586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807db124ab598bd2d12bcc9cf9e576c7f1de69849ac7fc3771eec8098fff224b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAGH2284671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63891fe46e4c10b8e26d06fd18e23e97131d8222ced103142040dfe03a05b14d. 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/TCAGC2270993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd090529374953ffa2c024248adb62c0c28d7c15a05541e3921c28380ae1916ac. 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/TCAEP2080396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a38c2073961a1edcb33ebc53935e3d472b6f9089b9914928a428e80c45be937. 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/TCADW1864094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6a86992dd1c81297ebcc9b5ce22970ebc79a6fe351119a17024700f5a85914. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCADW1864096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64632070df3d8c608e0cad0ea6e8ae5b0fcd8b226f07acda17c4a053f97743df. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCADW1864099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbf24c1380ae7f5aea372cf71263209e00e8b7622c82c233732ff63ae3e11b1. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/TCADW1864100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1d7abc24918575f8fe3fba0397a93ab466e20d2fcd31121f4e050ae9fa690a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCADW1864102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77afe0b7c138d19031da6ea47e60f6fc8de298a109bb0850a76638df1a4a69b0. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/TCADW1864103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2924804e77996a5e938da925cbe316f126a800fda3d3e84ff52deae6933ccd1. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/TCADJ1752449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ba633a5eef2cc0363d3f9ea83b302c1f2629f7c79df536da619eec0b0d83a6. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCADB1792259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb092caa8c367a0d6abbdea8f0d0d4a63bcc0d2114cc150359f8e62e251322f08. 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/TCADB1792262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c520d82fce5c577d2340bd6d92426906860827c5365010f9c2de4222cd6581. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCADB1792266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a29cd4a03dbd3c9db92b9393a6ee6eb8c0ba1bfcf038d7e572d3a68cd4c2f6f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCADB1792268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4a5927d83557ede41bbf30032c4ce5d87c7f08a8e6f01cf57edc44db51ee82. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/TCADB1792272.