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 0x6262ec61e318240b6251cf558a91bcc1d91c4fccbaf0e05b3b3962f2364ed891. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/974710c6-6bd7-4dce-b3fc-48eba2b4278a.json and https://artists.proofprofile.net/proofs/artist/974710c6-6bd7-4dce-b3fc-48eba2b4278a.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 0x9d3936f51729e93322ce4ad4536a2b8808cc9a876bc03fc7b9b55606d67b0e35. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/BXMRW1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497457a57a1b6b169e69c1ba77822236a1ee7cb86c27f50b026c22476bf436e0. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/BXMRW1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d61994a496597221e456615e0e890105610382dac78dd797815432d9183561. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/BXMRW1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1198a4a8147610b8b26e2aa01c1fe74e25ec843d3b44a7dde56478462b766be5. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/BXMRW1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd9a5a91c8f69915cae643e8210da16929806b6b9d29e470e68ccbee8ebe18b. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/BXMRW1400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916287ed675cfd258886ff1a6adeb2ee475587607179367e6d95c17d2fe3f4cb. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/BXMRW1400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5b90840e791697f4d455ecf585562e67a4edb92933e7110aa986ad0108217e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BXMRW1400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c8eb4befec4e81c06533b3939b643b492a2ed90fb84d1d7bffc221f61bf0ef. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/BXMRW1400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c728ab771912ae67715b96aff6768a67a2456f9fb75cca065ec8be0cab8951. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/BXMRW1400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8534bcfd3e1e5f321355f9f324a85addc593f7fc278df725e1c274ef7b278a5d. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/BXMRW1400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6972aacc616d45562171acba949c46ac3b0f7884c2587ce9589e89c91acea745. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/BXMRW1400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7a856529687d919bebb6a70413977d4ba13c93241b100c52e89ebc6c11cdd8. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/BXMRW1400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0397f6e7eb1af5dc3c1189af7663ae63804f11ec3527990cd83ee8271bfab59e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BXMRW1400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd43b4160bf736499b13d2edf0ffea16c5a25203b073f3765db5c24658e7b7d. 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/BXMRW1400023.