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 0x47832746d41212de3261a142d9cdfb605aa540b206533d9cd62c8d3f5ce43553. 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/e1a3aea4-ed2f-4f9f-ac00-4c0ec2c9dad5.json and https://artists.proofprofile.net/proofs/artist/e1a3aea4-ed2f-4f9f-ac00-4c0ec2c9dad5.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 0x38944640fe3cd48c02acc6e913e15c2795c3ea1207f0c841207f1842f07caee8. 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/ITV0G2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e9db55fd06e1f36f2c80dd97ff42c9ea6d985445af8dd6af92b24e3ccf6266. 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/ITV0G2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a672bd5f41ff863f014f9fabd2ee1026e6a684cd4602c229b570669e87f87fb. 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/ITV0G2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e62b2dbc1ba0b8171d1a3eaa30fa203bb9856b23528935fb3c5d24450089fd5. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/ITV0G2200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53686e3bd40262a99b1ae548d67d819f2aac3ea86e7bfcc157a0d1f90327039. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/ITV0G2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd0866511befc2ea8ad6d24ad5a45ebf22d12215aaec46cf5194868e16c6ad9. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/ITV0G2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8272180b1617bb809b707a7f3b89f3ffb9912eefd5b5420696d62e1e8703a1. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ITV0G2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50690d4baf46269a144b77f4c96ab63cf37154eec0629b80d218d05f810a1029. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ITV0G2300034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6c17685fa1f7d9091cef0522fb32659cb1d4c6bd8008857a8ff4cb39356b13. 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/ITV0G2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2c000a1c279c960822ea43a9d960850e7548a9f8fe1e7f8521d068f7cded0c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ITV0G2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed577bb44e0b6f5b725382db7d5f86b6bfac22815252d739dcaaa1dedc5fa4e. 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/ITV0G2400059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339b3e38654bef06f651a74a0d17acc30c79e0c9be539cc2317af98984e27317. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ITV0G2400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2256da680d8303a236926f1abe9ea995270bfd36925ab77437fe6cd13403953. 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/ITTL62330371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691fa67f0f86fec8bcdb6ede7fb23c5dbb23d62a306cd24197d6fd8ade924a8c. 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/ITV0G2300013.