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 0x1bbc09676c9876a31e1724c6c5a3a5db70e7e552dd3d4e21800cb4cbb95eb9bb. Chain 2 (Bitcoin): anchored in block 953689 (2026-06-14T20:27:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6aa9f683-42f4-49d7-aa33-bdfde4564e4e.json and https://artists.proofprofile.net/proofs/artist/6aa9f683-42f4-49d7-aa33-bdfde4564e4e.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 0x2fc8b744c3b8292ba7faa4c8513e034dfc85a355add878bb4ff872e52a0e1ef3. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/MX2831907111.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460d34439854239c94d8a29ff9d23b5f8a921ee66a8d007bd3fba9df3712f799. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/MX2831907115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683df33504ecd93557282d3537b1c3b41c35acb23a6648592ce465a55eac611b. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/MX2831907119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9704843a5bbc481649fbdbeaf1a2811d1fb1b36f2cda9fbd6175579b9d62370. 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/MX2831907092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72853b0925263b78ef5e992db949e5f30a5a4c35fbd2b92fc3f7f8e35c3c6a93. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/MX2831907094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a6462bd6118aa3925a3478fd11177855676ab154fca3f6698ddbf30e7fac86. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/MX2831907097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d174207f56ec8b228043349d38121b25fa59a0f597d28abf5ab31356e048aa. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/MX2831907100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b8425570dd7fde118d982000cc3e143babee0c5f95815ecf751fb1ab12200c. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/MX2831907102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926f1db159657af33777b1fc5cd88d75ffb4f995ffdb3c5f15af361b051a0e3a. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/MX2831907105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbd54e557ab1b52f57b9bc83ff434c381852957754677629b9a3c17417a4325. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/MX2832026808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8a35d0f6475f60f32da9abefe25a57f53f93545faf03aacd925b91be1db1a2. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/MX2832147920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626666ce55f53189d548a053e3d62185bc02f9379ce0ee66b291b3c897bb8756. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/MX2832261709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3248b46b6480b57658ce1ccfa06e1153f6867ad77c1e29d1faaaed1c5ade960e. 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/MX2832261705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71a51a589cdffc432cba913e3006c73cb8f9bc929494506956bf01368fb5ae7. 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/MX2832305660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295b250436c07a6d0e36ff3deba4e0c5d653bed943165b363b48c2cffa7c2e7f. 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/MX2832305661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725b2e30a861a715c5430a4aaf889f91c821818c3c4497c77313c8b9c10a1f96. 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/MX2832308130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2491dfad7644eeb6066d41116fb8a7ba1aab35350d40bdc0c208dc86e98a65. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/MX2832401462.