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 0x5e86137df32395962387f93fccfb165b0316be7cdb9aeba80606293881013fa7. 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/1594368f-3573-497e-87aa-876847684d3b.json and https://artists.proofprofile.net/proofs/artist/1594368f-3573-497e-87aa-876847684d3b.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 0x786d34f66176b21c5fccbce7f492a4c80155e50249ffdfd4ad56089ce239db34. 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/UKJ8H2500657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9406aef55a232266a30d5d2e5de6222b0e414033674bb312c87da9c1d03c1b4f. 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/AUBEC2489191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb4980a07a9b9b9d97df547e72d4ae235c91446ec54de7b301c709c0536b706. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UKJ8H2406099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4007ccf5a2e99ac6ac21f6d196668dbac107dd81b34e974ed5c5e90bd38f5dc7. 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/AUBEC2477025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc0f851bd965da9a04efde3e1a7a0fd1869e65a20e9f94b45ed27c26886af3a. 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/UKJ8H2404254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4418542cbd4b2948d06c41bfb4c90414100f43df4eb5323fe507a74cee12e2. 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/INH682400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1edaebda4784ad47a5b2b56d6566c92551613adba816867e4ba4d6c30daea03. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX452491855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15bfec428cedfee2192b27137bb9701bd723d4509c8a8b4de9a0f3b7c5adee6. 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/UKJ8H2403007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6282f18586be6bb667b3a28cf4667b61e2647d3a7eed6b2bf10d5a35877e0e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKJ8H2401893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3f007551c9ccc421ba13a3c06e280f95fa038c0852d48f4c7cb73a34f2de2e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKJ8H2401894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f742cc8e445a0847b158d699d0dd4b2a27c6de792d731ddcb5afeb80640ca6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKJ8H2401896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca70ad89a1700dd54661d0ffa53823cbdf46c8c3dd7ba74145503abe577510b. 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/UKJ8H2401897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9101f2c13bc4509d5a8ad4431e888df7bd7daa7d9728f3770d9c92324f25f4ff. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKJ8H2401898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06666eb01e63a4cdfe397c3abfa83af565b03fcee66d752253783bc8ea13c76b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKJ8H2401900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3d44333e455364565e4d5038c6079e4f1fdc941462a051fa1b304e11550c13. 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/UKJ8H2401602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0093e83dd31989c04122013a05e7ffdec21a5e194dffc4278aec01719d522bb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR10S2432362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8451764db8d2e59901d4d634c839e78d1b00afd99d6945d3f4c401d228f2c2c8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DGA0Q2377611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96247a9733d0e3de8008bdd01e6051e06e79165ba9fc2e8943a380eeb30a8c3d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKJ8H2300900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96666dcc612917f6b64f18dcb65f238e73bec15f599d5ffe39c39e71cbe4248c. 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/UKJ8H2213736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3867873cdc89b3ce133e46dc7a6550c6483436b05ded19a26506ebc6cf6153f. 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/IND712214072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78e47f3fe4b1813c925c4a852d20f4135f6cf9aa549d56e595ef8eda0807644. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/IND712214073.