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 0xfa48dcda3fab238b4f788449d3999b790e346d4576102c7e0ddd7c1520c434ac. 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/f8b3f7a5-38d1-49ff-8a8e-4f805ebeae77.json and https://artists.proofprofile.net/proofs/artist/f8b3f7a5-38d1-49ff-8a8e-4f805ebeae77.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 0x2a698be5e75d8883a8191818eb4e9db48f8f9f27a3f5436aaf72983100d06fd0. 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/QZB4J1816810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a698be5e75d8883a8191818eb4e9db48f8f9f27a3f5436aaf72983100d06fd0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZB4J1816810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7a48859659985be11cae2a46798bfd05b5e599f75cd08908dedb6293f32404. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/AUBEC1828326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423725713aa8719e2428bb2bd0a319a158ddff1e627db9d6e9a3df2ecc58e4e8. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/AUBEC1828344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc061082b608a8246deb8946b2e786883b745e6ea3c1bfb46890d0dfa1716cddc. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QMEZE1942881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ba981f730325fbbbc299b1b95e46ea6274eb691166d214181709d85ca680a0. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QMEZE1942875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc061082b608a8246deb8946b2e786883b745e6ea3c1bfb46890d0dfa1716cddc. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QMEZE1942881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc3bb61d70bd21f7248615c8842ae4e8e63412a2af651a6b910ca2a913100e9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMEZE1942878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2c3c1d03057c5a90444b6cd12e46d13c31bd61336b856d1477d13bd6d7220e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6MZ2054862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f017d171408e607f289e6fd33c58a9a83034f334032604b6be3b9f5bf0bc2f7. 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/QM6MZ2056203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887c9812c7257aa7cd6ba052e6542ba53d41e4776b32ef372960c2130c9b23e9. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM6MZ2056223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d74f19ac4b19937bbb6272fe3c78ef82f4f88750427c006df76d48678a8db1. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QM6MZ2053479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0525871533c2b0618c2aaf09e56925bc5be14c92a54c306bc413fb67f0cd74. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QM6MZ2053485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c37e2ff9b2ec68a4d4ae66f8c977f25b9f071f0e720063e3b918b2ba4c40d43. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QM6MZ2053339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5905961444917b3fca6647807420a50f1debb98d8200afc68dd1d6c6255a6ae. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QM4TX2286035.