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 0xcd7d8ef057cc097ca99702dcfdec4b080c98345eca140a744a17098f3a7c7c01. 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/53cb2809-dd75-473f-b80a-c79efa0e6061.json and https://artists.proofprofile.net/proofs/artist/53cb2809-dd75-473f-b80a-c79efa0e6061.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 0xe8ea12db40089182ab1bea971d4c22d94d33587fdd11733bb4b84ee14dec6e8f. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZHNC2177868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db6c6e0853a60343fcfe11a6cbf77ed7fe4c1bba34fb4510115cb50d71d7496. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZHNC2177869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a539d1c4a7f94e25bd69bf73bdcb3751ddd975285391f4fc77b5bb949d70651. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ72145215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72817f42fa3a6eb00633540f0d1cdc4a4c3dc0ea7afac26b22b3754aa593bad3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ72145217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5429431ba96adc30137aa69bc7f00a29390f89b5da9a2e97a8a49d83c53ffdc4. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZFZ72145218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437e658d27206e81b2671f8baa92e6105dbb246ace74e8b41d50694965d92e3d. 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/QZFZ72145219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4dcaf1469b7295c8e5d793eacbbca2eb30eff6bfbb905e000a4a78acdb0e4c8. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZFZ72145220.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6180d8554ecb62e028b881ae4b9d16be11e874b5834f3003546a4f20f9d8d5a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ72145221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538586e976abe4c7fca0145a01e94ccbeb09dce014e9fc5bba2fc33df3466adf. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZFZ72145222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3c6626db4ab7175ef269fe744eafa3eaad36f5402ec61b7aaae47bcb82c413. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ72145223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce725b9f92e2c22b97c8c0aa24513b6605d80af48b77d7663ef00da73f6bffb. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZFZ72145224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3355aadded0d2eab3e5775c3a6e506487f00dbc11a5f1c9166492852541d81. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZFZ72145225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525f1deb8621c32511427fe0346476e7274e8eb812c29dc4cca7c07fc17ff2a5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USA2P2335561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4824e8fc2aa48ff89f30f14f3475d212087cb020b454c3bf67858d197b70cd46. 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/FR59R2494137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9cc1874af14a1a4a6d214c832d1c605f8567e16b5468a77fd393aa1a337451. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/IDA431916416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861ef59760a4deecf47d996ffc13900ff2e93cba470cf02126b92302004015e9. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR96X1985262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2b9d03a9cedb6acbdd836c68e01e78dac7cf9404053e608696674d1e1fb117. 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/QZNWV2362073.