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 0x5246e31753e00705bf038a9392fc1a78d41552bcff0013088681b38e471aa2d4. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2994ffaf-d83b-4213-9f46-274ed1d8464c.json and https://artists.proofprofile.net/proofs/artist/2994ffaf-d83b-4213-9f46-274ed1d8464c.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 0xf7959a0727d08ad4f252ec21b8e83f1533429c11be65ed2955ab5eaafd033327. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/USJ3V2393273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44cad48032a00cb3f96d85de82163d7c3a45fe9a4567b284bc0cdce0cab99f2. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USJ3V2393277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f047fc0ac28c18fbd49252282bc4bf63733c05872ed468eba55d3fc8bbd010. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/USJ3V2393278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316a2bec875655f8d7454824b534dae49e80de850b9b3a2c5915f5c9b230da9c. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USJ3V2393282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c34e7ad880c4731b215eeace5dae07a4b15c9372430fb9dbf5fadae61c9c0a8. 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/USJ3V0639381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ce2ec0c08067c26476420fb0786825ed06c06138ee7d56ea94a3543c88de88. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:06:41Z), 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/USJ3V0639385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40b9cbdc914026be2aaff5b368eeeb3753c7fe5832ed9e89232049ef0d518f6. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:37:02Z), 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/USJ3V0639389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455642491723bf81c63699adefec43bfce2e1cb13275d1ae000b398dee042dc8. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USJ3V0639392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94cd68037ffedf0f3faba5d005fb48a9be30e1fc12f9b10a536df6c38ee0035c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USJ3V0639393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317cc932c2f4cb955c89c6d65d0404a10b6826a658e23a1907755dfb5f6d8b4d. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:54:49Z), 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/USJ3V1037078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f4cf126d315bff8edc8ccdfd5d32a33421f592eedb5cc0ec58ea8ae6973edb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USJ3V1037083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b5359123f5fe0cd29cbbdf6e69d31d47ab984d4ed881a770e75aa770b22d0e. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/USJ3V1037086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd46193f50a51379901dc1be0c2140b46c3441ff1a362fdc673ff7fc99a2f11. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USJ3V1219714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0449ab7677dd867f9e10f8558207ce570f597d39fce02744aeded13de4f936c. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/USJ3V1219716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4ebd492f8c59518473debb9a9d3d7bb8a0d8fa0b6bed8da9536e461c99856f. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T15:00:28Z), 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/USJ3V1219719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91501f6a41d270a505b91a24c3747e2753b810603ec96a5f924709087bdc9fa3. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T03:49:01Z), 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/USJ3V1219722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4a294feff8d24721a204ae519bb3bad3800f8b684953b8eaeba2aab2ede1fa. 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/USJ3V1219739.