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 0x7de8ca66e09470e7014ffd2b7b746d3c434277926f774a04f42701efb935cd48. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec63c0d5-1008-40dd-b75f-7699dc8da76d.json and https://artists.proofprofile.net/proofs/artist/ec63c0d5-1008-40dd-b75f-7699dc8da76d.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 0xfd07556344172d011097ed237e052f2f674beee3fc7e6dea3526e85bb626c086. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZFZ42423755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37226d4577e94781ce7939b3084cf4cafca6374d0c5495ef714b23f3f6a01ab7. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QZWFG2348840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2672d8b4a36a7c322a4b3800d2ee183447c72378ca7ad8b08a5abb34d3426445. 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/QZHN62424238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a47e5c7d970729ff5adb17c3ce62abe41400fc23f1d74936dfbeaa557ae2f5d. 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/QZHN62375423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b0adb16299141f9092e1f666be0db5c44a5b3cf621b611a68963272c0b210b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZTB92365770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed9d627d3c333095d2b676ab9fa64e5730ef158ad339bd71c52435019e42035. 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/QZES82173463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb252e3efca415340b326ae54c324f03b85f14a25a8c69e5db43272ed52ce888a. 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/QZES82173468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6a418d6c4bfc2721b92f376980271a2fae28df5a91181148b042941e497041. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZMEM2081261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8f1f33f9f6f1309852b5c6b1d711b9d6469f32797937bbfd7cfd1be8c9279a. 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/QZNWQ2450720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70825cdf699a98f454bbdacea8cd4b0d3ff2aa56fee5b008b7e2a4425a4d3cfa. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZW9M2324242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5a2ff4657fb561433bcc8eba35b5792c2628a98a4381eb6fb642181db9117e. 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/QZDA42483036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f0917f5d036a51f3a02ae7b80f68c1b519babfe712ee6cf8cfabf40c657d50. 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/QZPLR2307986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a07ce5d9b50c5a9a33e52cc927c48a138b42c3886d1cb0b8b5cd3abcc2260e5. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZMER2305085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8270b131e6feb42e3d989395c9995ee2bb8f050f14d7db7e3b9f6c40b88f4fd7. 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/QZK6G2315572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f67b4a4ecc22ba3dd18fd38523f4c7e78fa0a1f81d7f38ebf7b1e74d14384e. 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/QZK6L2319941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3582b3b524d9408e8dcdfcec344609e1872fa10d5ac1bcc1cf69e8b282bbab60. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZHNB2248346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8a431ca783871e7d6113820fefd274f0b10bdcdb3c2cbc03b969937d528a80. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZFZ22278879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43d22af2b25f6652a79bbb7bd45b79037d0a48be010e90358a2bf1d7edf391e. 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/QZMEP2096483.