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 0x4541ec50cec0b02d9808c707964f7f1a2029de44a473e03e8e5672b2763d3852. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f94ece8-c7df-4bd0-9dc9-48c6f119f220.json and https://artists.proofprofile.net/proofs/artist/4f94ece8-c7df-4bd0-9dc9-48c6f119f220.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 0x8ab5ca449c6877e60db0c406233d30f0b021dbd5a950c646e7b5c19c85c50682. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBMA21916107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cc2b125cc29f37ce771c3ed5aa97c53d97086c0cd29b26b50a78fda958f813. 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/GBMA21916106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf93c8fe583bc81c26af5d28e2017c5a96c2bfdd1810b5be4ae31c99b766c429. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/GBMA21916105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba719d21b742e818168f15ce68207a3f3bb1135090e309e24e1975060e68757. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBMA21916101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e7c7efe9da84faf4029ef37e3c00a336e986d22a9932719e7ed4c463c4bb3a. 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/GBMA21916100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5174c1f9fd4763c9b7836764a15ab3e08db65004d0e7ec0488f3de197dda759b. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/GBMA21916099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c173ab5f22b24b3679841a9d410073e59ee0396d4eac62e9c84c676edf3775e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/GBMA21916097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd213703c42c37d366acff1d0e7e83adf0e982f2499109b299d2d74b084165507. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GBMA21899216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d61133898000ced9d3e275aa462a570a0938de58e4a1db1c3b9deec1066da5e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GBMA21916007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe241c3367fb296026d8449cc1ee735896d37216377e8efd1146841a92636c55. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/GBMA21916004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c2c5d5df435e8486609a18debacc4a68c16b8394a37ae9f3abf5742357e1fd. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/GBMA21916000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe466b391a858d206e76827b99b5776bc80de90f746d61ecf5a0fbc96110b3939. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/GBLFP1975497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7cefee0cc8cdb55d61e23f14951b4c45b2e41961b5c367094e8f1c8db32c15f. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/GX3Q92372948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf10d5e1376adebd5041fbbbce2aca1bc289dab6b1ff7f13f49ecef288977e9e. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/PAEZ32500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b0da183852281dfdd10dec3588e86d49e6dea6b5384b16b1e73c5a61cd729e. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/PAEZ32300003.