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 0xe75a8180138458e5c3a0daabaa7e0040739a23db8c6aab45515902214e71feef. Chain 2 (Bitcoin): anchored in block 953627 (2026-06-14T11:43:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f5b8ab4-d980-4592-b088-d5752613f692.json and https://artists.proofprofile.net/proofs/artist/2f5b8ab4-d980-4592-b088-d5752613f692.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 0xabcac2fe64385078fa7cad1795002346b8023a50b45e1894d43b734d8a619c9a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZTBC2326447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea1abf499928c0faa0cb841499f2ad4231a2f54e8cd7fb0c08a1e88caba47c5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTBC2326448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2030aa994a47fe49f3bcc70fb8179c1eeb363391d7990fcc386c223df39771. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTBC2326449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077938c8ececb28521f684947c025994484663c80533cc8ba0bb5ae9e1707ba9. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZTBC2326450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9559d06072306ad4718bae1d14ba54b026bf4518eca6f8f5d138a60cdeab3ed. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZTBC2326451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b728eb6dad8ea7c1686e6658857a26ab039d43650194c4d27f18a56c0cebf6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTBC2326452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a072f68d312f99546bef11f68cbd0f513d202894a55e782a09d97141e736c3. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTBC2326454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51a824e10f788593e82bcef9f65b6be33ce11962ac2733d0343ab3f9becf9e3. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTBC2326455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855b91362d9d7bd74fbc40207ab82482c267673ae1a99c93a41716cefc039b8a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZTBC2326456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b39378fa935126765aee6c24c47672a35529f7029e453f7190a70271686fee. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTBC2326457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d4bd999491cfc61395ed181e58a67990796f8ea9958ef0e614f327625b3c40. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTBC2326458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef7f00b8ec6ff3bdebb421dd6f5c63df3d1129096dc88ce5e135ca3a0ceae8f. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/ARQIW2407389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3955f59efbf6fed52d9e827aebfe28df8b70a39e6e3c9fdb973ba5f8359435. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZRP52256811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537536c3309f12d7bc0b8f6ea231d45a4887b4e92128eedd7c4e02a4ad68378d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZFZ52156325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb19ba2432d13134677bc14d86546bb81e57310e049010469466ca6d4e7d45c5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6H2034293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca3fc52ececc494be1f33c1f5023ff7c9494189626cf4a70fa06cd707cd5061. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ARQIW2416130.