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 0x4ecade46cfc79478a1e4bcb286d5eeff30b2fd9003887e8f27fba0bfb341d188. 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/a39f8a7d-d35b-4eab-80c1-c877f86e0216.json and https://artists.proofprofile.net/proofs/artist/a39f8a7d-d35b-4eab-80c1-c877f86e0216.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 0x8d8b86cb5aaa379dd9584824c746f0f4ff61c673293feac5d9c2cbad8f92c60a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/EGA251709379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07029f6f9b58897a5de52a602aba0bce3f9e0b932023420c5ca8f89cf7b0a2e. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/EGA251709087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ba13c7912bd47249dbde365a91b9c2523de7a8a0a92a4d11ee90ea7f968e38. 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/EGA252102173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982e878ace97c48853771ca8956936e051377aed7bd9ccb7e18190f6b0d33e90. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/EGA252102203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9337c94f7ca536e9c013688e19a0a013533d8a92f6b75e3ff9e4e59390758020. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/EGA252102211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb310219bdb22a1447e01a4bb4042145f5d32958987384a4a4a5ba68133b8eba. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/EGA252307245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa762ef160042410c2b936f32953315abb37cd3cdfb3b9688871c143b8a3af11c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/EGA252403735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6c1518ff8ee190b44540cc9a621170edf31818fb1a18d82952b0ee8908094d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/EGA252409601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce6ff5e4f091ab867b70eb862df6da2497ac3cb6440d0ec221f0a474262c0af. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/EGA252413349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fdb6ee357e771faef2de3c1e43416c2486ca73edc9d3d70be18da59b0e4c0d. 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/TCAJE2576573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cb04ccbdcb25352efdc120d7ab112e6b1658dceeef5c572dd37730cb3ed95e. 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/TCAJG2585165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0738eb66647a15d047894bc7cd35d2c6029734289922b6f03cf0358ab3688388. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAJM2521142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a9bd5c70007c5b395916655529323c3d625f7a1d77da4f19c2f89734bafb3f. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/EGA252511052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d0ba10d3d2b5dfdbcef7321bf0c901bda4499cdf765aa0023d21704462610a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/EGA252512454.