thumb|Redscale photo taken at the Cimitero Monumentale di Milano Redscale is a technique of shooting photographic film where the film is exposed from the wrong side, i.e. the emulsion is exposed thro
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf506aaa8cd2ba92cb60337c1532ce89b27986fd5ab477b59afb84eec0ceaf3e3. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f9ad495-14a1-4189-957c-3fae2eb72efd.json and https://artists.proofprofile.net/proofs/artist/5f9ad495-14a1-4189-957c-3fae2eb72efd.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd240ceaabc549e30e1d6c60ba8b3d396bfc14d1ef482691166f6f34b5857552d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/SEYOK2134973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6a6985457f0e18a9df81586bbb9beae9da75107e90e91590ef54e94b17531d. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/SEYOK2134971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53971a141a17fb32887554d9017764f281cac2078bc17e2c0caaaff6fcfe492c. 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/SEYOK2139087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7334d17dca9ddeb0c179d35337d11c20bad7c094fc4d907c33f3cc2ff3e6da22. 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/SEYOK2134981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12eacb98d2f263d9f4a0a9d3cacb643c441529ede5bab3768ba489bf0fe6d062. 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/SEYOK2139088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a1f1eb4476d16623fab78c4732a0b427b143e23691a8a26a18161600dea7ce. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/SEYOK2139086.
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 0x38ef9328d4604db7cc53b454a63d9170350a21190295ec6c5b949940b5d6d977. 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/SEYOK2139089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6789859e0e88a2acac39cfc8f7b966fe9f693b4f444d5493ec8023a104c69f10. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/SEYOK2139090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40cb6afd947d60c6f1bae37a5577805bab3a404befb70d9bd493311a5b8834f7. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/SEYOK2139091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c73852846134593de1e8347fd4ffa9610eee78d2951a249fb42d26f01c44638. 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/ITCG51911001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0c82ac9e07a82baa6e93e20d4171de8d917f95b45d188797524d5be58c2a74. 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/ITCG51911003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8ab3fb4dce232463d77d0ea038ecf7f956b00ba27d04334a271a34c6c00a6a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ITCG51911004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc0c75790c1466ac09c4a3720117c4219e938a025d7ce0cf145f56181637f79. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITCG51911006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549c76f6c2132321a74de7c245dcce9ec123f43371bfb093bc26c1d3e0a09ab4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ITCG51911002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cc2cba3ff692a68132e2d8bf3f9eb97dde1c85805ad992f5a2acc9f8768734. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/ITCG51911005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b12100aa89ffc8f6220b71b096136fbdc12c2b69e6e72545b15a467440b64f6. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITCG51911007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8761205b24bd6d03d6320f80fbf906f4c21708b6ef03c2df67976ca47c5522. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ITCG51911008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126597e83444f3361aaf69b8126adfcb30b34a8ee5561c6c32a7a7f3576c0ff7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZANL1723033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cd6c94834ec1a80f7d6f00b5ecb86132a6282bce64409f228ef7c43208fe5b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZANL1723034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b209384772461ec96e838ec1427c31ae71030bc22a1c5da84d46194fa694cf6. 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/QZANL1723035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf81f7a37d21909c15049b07f51c6caeea410fcea7e4760568481fdf87c49ab0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZANL1723040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c58ba51d394864c43a46e9a6241a8acb86989d4edace4e1ee9f8ad8a016b9c2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZANL1723036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf58d64adac127339e316b6b4f73b81fccc69d9becb9876691077481abd23880. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QM4DW1862319.