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 0x01425076d0cc85a8349a201687dd1cd1355dbca037e8c5baff62ba26f4e7fed0. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/93b301a1-c92d-401a-9867-f2d4dba30502.json and https://artists.proofprofile.net/proofs/artist/93b301a1-c92d-401a-9867-f2d4dba30502.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 0x5647e77a1d474fd22c2fe5dce278d49470a4a68ccb57e19d0c76e3a06c63127a. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZWFM2566491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8361a5c8f7189a730d32df1f264d9eb62660917d2785f0faeff27033f783c4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWFM2566492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f17712411c6d710698df4076f377ead6b36620dade161cef344b59dc18ee192. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZWFM2566493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb528e6c9879e9775edfd4c6adbca1135cdfc5294d149ceba82343801da37e0ca. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZWFM2566494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2951bae4a1a89e92ad97ff0d9325c56d9b8122aeff77c81100e76a09c3be60e. 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/QZWFM2566495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e31b72c668275e573ddb09d39149d09ba1eeee28bc48119204980c4f4e0daf. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZWFM2566496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae488e41c54435a5ed799e133e4cc1028275f315cf23c04cb1c8ad694259f70. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZWFM2566497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d5e0ee3f23f03e10388330ba85b403be30c1695ed73c7d713521753e82dbf2. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZWFM2566498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e8ac5b4ced934c6c87b096ff5b304495559e49914cec6338bec8084f413249. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZWFM2566499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619e35529da724a63dd1684b4f3486c5f24a9cefa5b5b3ca9ef819f54fcefe44. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZWFM2566500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6dd6524d2b1bbc9e4de3da94b51fb899605defc5df36f42baeef5b28402a64. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZWFM2566501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a5cf02689fac7d1af3389901d3a9c1301926ee928f4478f88f4befb3770f34. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWFM2566502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ea2a66d0d7c2019e2737207c9f77cf6e171da40c997c4e59ca1a7c990de3b4. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZWFM2566503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4293c9345a3ed921c026a06c64669383b20d3de7cb96531e975db136ca53f993. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZWFM2566505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887de85e9b12bc1d61feaece0e0c6f858e25c1debe9753b044f42a6474ed6c8a. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZWFM2566506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3643b07bbce5c6500b2bda9ecc58efe95f10e0bd92c68cd234bb296f681c3687. 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/QZWFM2566507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5b17adc030918043fc7133bb2d7df03496c6083719673bd6291f0ba317bde4. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFM2566509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691a2c72221ff22784125c85b4d0add762e6b30d0ccb629afc465fa837bdf19b. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZWFM2566510.