thumb|Black-and-white monochrome: the Eiffel Tower during the 1889 Exposition Universelle thumb|Color monochrome: night-vision devices usually produce monochrome images, typically in shades of green.
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 0x5a33ba30b6936280597f55ff3978dbb5fd5af80c0376e3b19c3b899fa4215ff3. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/efdfb882-0053-4d74-9214-1e28e1deb401.json and https://artists.proofprofile.net/proofs/artist/efdfb882-0053-4d74-9214-1e28e1deb401.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Unter Schafen Records Compilation, Vol. 3
Cryotank Volume 2 - A Cryonica Music Label Sampler
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 0xafcc5efb5b195b5b96e6619e2dd617a50a017d5df22408045f7314418c8b8b9b. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DEW271301205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189961554ef4900bf659ee204ab42b639ef4aa45703b2f42c5395d19e5c22953. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEW271301213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54307f286e5af36a1cfa1c3fa3bac172410726952b32af9c112062903de8a054. 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/DEM250800202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3239e5976d4bdfb8e9181bd387a6b5b71fea6735e3117d07c7cc902ced72a294. 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/DEM250601011.
A Series of Catastrophes and Celebrations
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52dc02fe606ff1ff7a13bf065e1c331dff2b8779583d241a96fac0fc6d40d16a. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEM250601021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f656f2bd9a09024b37ef9dea4df64d404d5772d180948a24acf5cc43f2d276b. 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/DEM250601031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab51397329a2fcd974ee4ea53e465d50a807ffc5c5aa38113f1e626bf76583e. 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/DEM250601041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b6020c30a258fa202bd3f81e59ab184e7bb84d8a2ef478ea70f08688dad689. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEM250601061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf4c6ad65d1bc37a750763e107c05ee7785e3d10d9abb8a46bb94d97bb9ced5. 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/DEM250601091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f8a3c72545a2dd2e4621c4b635930df0dbdc5f34b094f442f8a751204ef758. 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/DEX500310039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e835349f8665ad00820d9950c93b8fc015e6d74ff37639055decd419fa2500. 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/DEX500310033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795f6d81397fa6b17351326ddcec8c86768cd7cf3036e02931fe8c4a504d9e86. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEX500530002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf172db9203e1360b176f7fc29a9a07312021c4e676f8fa31688ed9046d00a9a8. 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/DEX500530004.