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 0x71e5d1ff35d3d6d025c8239c16707641761ca44fada9093f7d02739854f301e4. 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/8a045f78-7223-43ac-a2b5-141074b8f493.json and https://artists.proofprofile.net/proofs/artist/8a045f78-7223-43ac-a2b5-141074b8f493.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 0xd4037b0d3bc78c3f4bce82d087b696819b46039123b3ea8af37cda9d5cf32145. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/FRZ180400140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9874f15c33c377f31d1bf1768f75cd3cf6558e42d29ac3c6a537e76ed1f39109. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FRZ180400143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e70eff3f638f4ff402f61f86c5d82177bdccc40a2596edf231f371a408b4242. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/FRZ180400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac025c3894cbec2f181ccf371c597df46629070a65b9bf53759ffdc096c1a3d2. Chain 2 (Bitcoin): anchored in block 956777 (2026-07-05T11:01:08Z), 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/FRZ180400114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ed6191aabcadfab7e31aabb18e624b79fa4ef4e34c59d9d65429ec3c715a37. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/FRZ180500515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fafc3439cde786df046b39389d89719dd81b569f0461a053bf7ed6c9473d074. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/FR6F31101030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe086c3c513fb9c3abad9fb7e262b987cce27ee65152a9421b449216d1093f85c. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/FR6F31101140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d819571c3351f2e497ae9c9bba2f382439da01d7304fdf30cb7bc1cd6958c6b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR8GV1721070.
Du Saïan Supa Crew à Sir Samuel (Non mixé)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7ca5fea70fc1ab93f5f96d6bf195fd650dff162c091116735114022c8a490e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FR8GV1815850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5222fab50e5e23572709f3aa74812e2662ad476301d60ea28aa27779526a8b52. 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/FR8GV1815880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38d12e0053cafe1e6480ef66532a30356ca8febb267c7e726dde63e637ed831. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCADF1758697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc21ab1a5bc903b9caf2bb20a2edac43b2e99bcae6b61cb0d721c6ab7836cc63. 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/QZGLM2072079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910b621edd23699b12252b5c874a7dd12b1f2125c0082ae0daa2990e734a3bbc. 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/FR0U91401954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421c977607dd228e187224725f06772067822a84188063e522f8024d8c77eda1. 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/FR4V31100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5e09254e34ab2c2c0cbe26f54fb1048604dc9c95e441b4b539e0fd37f65003. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEQ831200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056f076c55c53e0f0a20f0c3dc8a29eef1ac7890adff009b78607ffea51b99de. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/DEQ831200003.