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 0x41a1178c43fcdc11bac26bc22a64d22fd3f799820e37638ce2f6e6aa0bc30cc0. 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/1600252c-26b8-442f-a461-eff7764dc284.json and https://artists.proofprofile.net/proofs/artist/1600252c-26b8-442f-a461-eff7764dc284.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 0xfa6cd6217ad879b8b8922400cd6cda380c01459cc5b819f3ccc396357855de0a. 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/QM2PV1733816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41961ef0408910d0d1ba8abf4fb6ca8edc173c5349ec6f8dd436db26e1f361c8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM2PV1733819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fd33e3353924af7adeb283ad189f3ad748a9dbdfc30bae5d367d59be64b41a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QM2PV1733823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc90dcd85de59661e97bd079ad6d1a2aa23963ffc3548c0d091b339d7fb4d564. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QM2PV1733824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f15b296881bfef53b669a8d51f04274e61b9a0b5f6e513abe0209860444bb0. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QM2PV1733825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dee06106c38011cb6d39da9de8927a1807746a499dfd5f12c8b98b313b9d73d. 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/QZES91997462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19bf4aeec09046c807fd6ffba96f07c48f55a33feb0045922d8a3d821229ae1. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZES91997464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8c96f4f4ef99c05e57bec8d67524f85ddefef55250fa266a097a04092be792. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZES91997465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7358eb502589bce12f3a3f0d9fdf3ab5f5ea758733f5700540cc224994634c4. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZES91997466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f8dae1b40099a50fe38a3632390d51d316ca07f4ef8fabe28e71a57d1b8bdd7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES91997467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648f4a0e07b660a6b6a6a4384c6b897c45176429098a6c0fcb8afafaf00a3143. 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/QZMEQ2015872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738f82756dc970fd6810aebe9094e2525b5ee8fe9ee975e9e10cb814e4e6af8b. 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/QZMEQ2015874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc23e6549aba3d31c41493fbbfa0e70d9bdef3ff05c26831219df0d31375d818. 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/QZMEQ2015876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccae54b01eca5c9c7c91d3657b1e9316529701efa9d4380afd2a031ec7dc6f3. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZMEQ2015877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561dc9e0492ed5335430b1ae31f407546a4d6393a093b20427cac66686e344b2. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZMEQ2015880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce85d038fc4660f3d7e9cb98e5c7c5e22aa3474535cacdb65668000e89003aa4. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZFZ62114253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428e80ea9891cd6d5ce2cfbc007eba1a235956a0a54a301dc952a0d5a0e7baff. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFZ42212101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c11b2c173bc1fff70a3116476f920e93f6ba35cba0fb373aa67d29755ca83c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZK6K2269795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26b4fc358a641a29581c4e1a838b18398e1964381094f862ba281d03f1d0627. 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/QZQMB2105019.