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 0x904d7b409b6c3d609c0bab43e0b1410bba7b89d47bcb001b0d3660834e56afa2. 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/1089901d-3fcf-42d1-83f6-de8cf7dbe28c.json and https://artists.proofprofile.net/proofs/artist/1089901d-3fcf-42d1-83f6-de8cf7dbe28c.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 0xc06b47413bed2c7caa87ca5d712cc197c450519cbad16c0f6dbc14801c5a1b7f. 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/QZNWR2217905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9c700deced55a78f19e5b4b1dcd7b0eaccbd3dcc03304a44084831b98da729. 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/QZNWV2282302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08b8b617a8b5dd47215ce7314c16b4e68686d530d3681a286310eab6951c258. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZFZ72324983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3b084b6765bbec357bb15d3ae61b48f6125febcde3e525e22b1454839460e0. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZMEQ2342300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27505fea2f222b76847ae5e689401bba67187cc3ba1366a0c913effb9cddec5. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZMEQ2342302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4d6b3f82221626cdf38fa630bd6920d29b51043178a8f9d9fbb66c663f3e90. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZMEQ2342305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf833d14749d0032cd277e116ce3c07fb504dabc108a6cc3975668b5fdd6a59. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZMEQ2342307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cbee48ba1ed0149c556a0f3736fddd51340d77e62de2b5db8886158873727d. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZNWT2430607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a545b42f00cdcaacab98b42a11789da45454e70b456317c160b8eb334ab1103. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZGYN2402994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca7fd5a9584e3be96def6a79c463b8a09d63da67ffdb37733522c106b39ea96. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZGYN2402995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74253b5cfbb1a38976da6eccab400d60bdd753e70e415445ff6b43d5da95b09. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZGYN2402996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436479020e3558efeb538a8bf2470522fa4ca8561585d985d40cb8d45cb76da2. 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/QZGYN2403000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78772db9c788226f06dfc395c4c7cfbd84656427d56079cbc2ac648fdac7424e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZGYN2403002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bddf44cc81881ab08cf234f9c34301fd409eaf6cee1f94279b5a89c4238001. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZGYN2403003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e95a573b9634f23d0d1e73b5017562ec06f166c9bb4bafae11b07a1024fc42. 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/QZGYN2403005.