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 0xbb33441c21ed5dde15a8db677085ce9200e01587e5a515165e696167c97054cb. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74d31a2a-8393-47d8-88ff-cfec0e42fe48.json and https://artists.proofprofile.net/proofs/artist/74d31a2a-8393-47d8-88ff-cfec0e42fe48.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 0xa4bdbd4337c5fd46fef93f369ebc45935b2631d6a2482cc370209cdf917a694c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NL8RL2446458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f15db9312af5319cc8d87cbb4fdb45e528669a9b4822cd54c6d41df4d909d2. 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/NL8RL2446459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a8f7a348d406e8ca3605382b94352be0eccf432bf2908bca847a4cb4c3a148. 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/NL8RL2446461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8390dae1512b0a8e5cf7793fc8d20383d721f0f22ac6f0945794ce26d21068. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NL8RL2446462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a4b1b70e09347a67f7995e8861b13f85d826144abdb5b33224aa70438292f7. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NL8RL2446463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5838648247fd27bba9fed89d3c28b46637d73ca5b9cb52585fedfabab130b5ab. 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/NL8RL2446464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38e79ce9e4e0d4014f77149693de117774281f593ea70b41a2e336894a9997e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NL8RL2446465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef9770a17163e725e0c5f5c1cab33c1e8605d35a65460bfd475669eee57a4d6. 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/NL8RL2446466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cdfa602cb00cb0c4ff36794dc26c0330864db49c3b51c4855addd23b7deed7c. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/IEWNY2431481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac9c5fea2ae1f74c08f14ada68a9cf40778cade39a00cc8de2374fa0e3e0157. 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/IEWNY2431486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa7d628ff8dbca9fa3652563edad593a670b802e2d5863394fcb921be83ccd3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DGA0L2349403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6e1364a94f5f23a86351e51cf63cb53495adffd47aa189e912cfd3db74305b. 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/FRX202370711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0822b0086b1d3b34d75298673d83af7478d5465919907fcb449da5be48fcfe1. 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/FRX762127508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a107ef618d18385596ac590c97227e93b25f883b54cc9cb6da4bf85017ff50. 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/FRX282125365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f34e0e0a2b25c225d1052a1fbc531aea74ef5ade1ab3de28791c869ecb2fad9. 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/FRX282125366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6937eb51e9348dcc8cf62737ded6712f0c5943eb35b09ade943503eb5a29f7b. 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/FRX282125367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2855a0bb7a90524d69ae33f2f9a099e54406469a04ea32d772d295988ab840c3. 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/FRX282125368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5d7ca5d53e3cfbb2dc36a83590e1d66ce45de23149487b7bcc1674b419823e. 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/NL8RL2437647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53de2403373bf30877ff5446995498810266d1a923a5ebed4d6bef2e19693a1. 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/NL8RL2437648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9b4b1b1847de1cbf9eac7a4690a09977af6e4fca7ab7750d5ebd663732992f. 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/NL8RL2513127.