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 0xcbb8db0c28de9cc700a9b01bfeb1d416e47b3ae771155b4c81e1f00976f06d01. 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/eff4cc96-1ee1-45ba-a16e-28320a8f2905.json and https://artists.proofprofile.net/proofs/artist/eff4cc96-1ee1-45ba-a16e-28320a8f2905.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x049ff8eab492b54352801448e8cd553202e65051156e08b326833677bd528e4f. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/INH102409627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1559942b071a45d8e28ec12ba651adb709a61f523079f7356f379a2dddbe4fe8. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/INH102411102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3934b066398a32b039b6725a2329a92905a152bf426614d3bbb8f43a53ed9ad0. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/INH102411926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667533cffb81342df3f8a64cb6ecaabeefd769b97323fd6319e5ca417488ed87. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/INH102411999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38f76e76fa8f8d125d11aeb3f12ad2ce43ad1554563e6f967aa2102da6b8fc1. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/INH102414479.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2517374c4d1d2327a7ac2d183637ca13aee44095c7c39a32efe44eedf72be34. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/INH102414484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0bf57b486dbaaa243aadab365ceb8d41cacdb56cb372b8c9e0bd0db13aa687. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/INH102414492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88df4356da44ed0acf61d78ecf58032994f82aded4d49758fcf6aa291d13678. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/INH102500212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d24b0605aa64c8bf8673d762859f4011df960b5c02e0f12a7f02e3e4100c2f7. 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/INH102500834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f10408f9e86b4e87ac25d86d9803c30a20044875fbe45a0a15ede084bcf3c4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/INH102501027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3ce3e5875e0fcc38fdc7478c07cbd5e3dbd0be1c08e8932be2ccceb56a8e13. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/INH102501459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17838352032b71599dc7b1cbe9bf048a58a6a61eda1a02725e5580519bf6f7a6. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/INH102503288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb745add741afdb22e6550ab08e81a3e6aad2a395e390721829f36d779abe28c. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/INH102504704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d0fd07c8b0bcb788c8405ca4a4e2d7b0e2c443c8d912edde7821b354cc1f16. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FRS182129759.