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 0x4e45a2fa8f1833dd6a9ddf804f31247f5ee9b8019c8d150c79a83d995264f6c2. 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/9b88b6b0-042e-4c41-9758-6f4453f9013c.json and https://artists.proofprofile.net/proofs/artist/9b88b6b0-042e-4c41-9758-6f4453f9013c.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 0x2f60a2ab937341e931a5764bc5eec7eeb7c38e039cfa5414a5017652161bee12. 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/QZDA41848095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4622f60c0093bc46eb5f11392f94525fed46867065b511385e27ffb730a60265. 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/QZFZ62039576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e28eff96a2c59cd5c7798f146a4599b41f8df510737d291672dae0a3bd829b. 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/QZFYX1941251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c8b97c0446a4bf7cc5f72b31e0aead7f82676fca367ba419e01c8f9ebb887f. 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/QZDA41908881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10666c18565ca574d7f281bfc1766fcef2151b70d3ae1941b1770b17f59fd015. 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/QZDA71969359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8454470a7e1517c44c3b9b52b8680759160ad35aa78a1ed9bfe1d669e035095a. 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/QZMEP2118502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1544aae90a8de93fab0e1722b8adc1b4b777e005e74dd43b420bd71be5d76239. 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/QZFYY2134097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3dc6038ac2e87eef65056a5598c6501cb390196aacdb5b9086040b95f56eae7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMEP2118508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88b1c76db79c332854656c5a7d163e71f747db6c17daab3fc683a036a214b89. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMEP2116841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6ecade46f2c1209392967e61c8109f6ecc3e83bd5f62d7e8b7f0faa9ad3558. 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/QZMEP2118512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bbddd3a07215a374a5ef132a61ae65ab99a1567266b3d43eded64b8af4121d. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZHN42176956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df641794d9f6b651a5c6ce947df87e20b5caca6fc9a94e8d5c2997c7edb793e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES52152900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd68379f3f238960e20bfdf8dfd98b6c119d0d018e75ae07f40c56a6cad26e68. 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/QZHN32144010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66fb4d119bbb698b7df463fc5e5b350eaec16215f7ff04577619652690e94ada. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTBB2441215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06a0b3ed4deebfacc0de536a2f13ab86357f1a7548a46183644256765ed6744. 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/QZK6H2378690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653016adc9811cc188aacccc0bf84ab4460f5c0fef9b0c47d340ec42995fb755. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTAT2161512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ccd08ba1f91082331180bb94682b49c2953c9183d0dd269dc7cf349a0689b8c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHN92058367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193ee3771145f11db4bc1bf71bf90decc261475f972e9fa023a34fee8a3ddf8b. 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/QZK6J2127092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ba52e56ac6c70938de1357fb8144a2e9e9c0334240215fb70d728f7582dce5. 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/QZDA82190483.