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 0x60518e1da57368d2b6f81a656c499a54969f0689e0edcf18c3d384178100c9f2. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d341813-a45b-4b07-aae9-bc86a408ca89.json and https://artists.proofprofile.net/proofs/artist/2d341813-a45b-4b07-aae9-bc86a408ca89.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 0xebd4be2448902bf80eea3dbc4b00d37126531bc409d6ad12879f2d04e5f3a01e. 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/QZFYZ2062504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4148cbf071834f101ffa31e4a939c6dd6879533a5d4b30643b2e642b35f5893. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZFZ22070267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8437e12e07b6196a447d5ec2c1057149e33746707801c38305c79372471d65d. 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/QZDA82030457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e90fdaa20262780d123cd3965fd87a583dc79dc3a7bab77d2a431f0cc0d92f. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZHN42020411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f966c0a7445a90303e7435ef3e2fa3c93364694c53da7cfeeae679e726fe1af. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZTAT2255709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea9bf193824c10cac625130239f6bf10ce94bd7c93c5db49372134f76c3357e. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZTAT2255710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857a41b9eaa95ebe4db40188fa290d8fb97b39537e5d85191fd97e71d46425ff. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZTAT2255705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f5eb9762740810906af6edc929c3af262f5d4f3557b851a817f85d581d7e0b. 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/QZTAT2255713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862aa8873a489214a8f340b06a5082637f2b9c37d2332807c675c9336fef85b9. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZES52519526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb71731513c48438fc731e5e5335d73aa69d4a9376c28cee4000f3cd425b832. 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/QZES52519527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad84bf9798ad4c600c280cbcdb4a08c4bb5247dd3bf275eeaa7c7eb3fe684607. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZES52519528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ad8fafc7f626112c47efbb25b9802ad680e61fedd4148d71bf7b916e61b28a. 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/QZES52519529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacefbad6a8e335ec7c9fd195c7d0fbcffc6ce022fd242c1776039409b6ffd765. 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/QZES52519530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63943f18832cfca0781e6d1bdbcb7749b7664d95b15d263b5cf069f55b1b9e7. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZES52519531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ad39948d05a1de54277eefc8dc5fc71de2ab91ff0854e93c8cf8a0d2acbdbd. Chain 2 (Bitcoin): anchored in block 957233 (2026-07-08T23:07:54Z), 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/QZES52519532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d219b2c1dc2c2d0b7b4f55b9da7cdb1f2514655283fb904f1a17dc132a4d1d. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZES52519533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38606d7505a8255b7bbf33e911f044b6bf15fcd1aaff94576a626d9587ccf2f4. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTAZ2374669.