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 0x09f6c73877652712e86f7f8c8d32fed861c28d38175018fd307928fc101e02d5. 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/1319ddba-23cf-4ad2-8999-dffc5ae200a1.json and https://artists.proofprofile.net/proofs/artist/1319ddba-23cf-4ad2-8999-dffc5ae200a1.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 0xb0ca642569e874d81832e393958b74165ef22f08f7e8a6c97f5b6d762d3d0439. 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/INN241902127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114531306a62bcd087d104c0cb822bd487a938c875870e921f3f5b46bebd9c60. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/INN241902128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8014f0fbb7c7e8981506f16decdb30c430c7e9715de74713011238331660e160. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/INP611900142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9206d7ab7605bfccf6c6e99f89976016906845f8b12c74b28e22f02b4d3ac83a. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/INN242106355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc173d25f117292f3c00020e991b2445dc6d750652f6b1971f6af941c0abaf60f. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/ING212309010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f2f723b053243b3e8a364d18d0bdd69a20170b441dec9483d007fa5a2d5876. 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/INN242301197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a43ee2cf9f482d64c26db8c8b719d0fd0b1670a8a91c6263dafc47831b4855b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/INN242301199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe714afe2f0e0e4b02083b2f5d2057a48e4e0ea92f65e60b6caa55436e10b406f. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/INN242301195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa946844fc422b3f3b7d6db6d53a470a0ae68f3e73f30f098c5e43b391367c116. 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/ING212312409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9868214a9148b16cfc6330a8eed853c3c56aba2f62dc43528acbcfc876bb1590. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/INN242312379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde61d8141f2a244f0e5e0f7d8c304b0afacd54ca5126a7d4f2c4947f832ba2d2. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/INN242318363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951355d5f0cea7f1968dabbea479810a805952ce0425110b4bd9a7ffef79a6d4. 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/INP612401086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cccd2904ac3d92c7adee0b6f52e2e4575be26cc1eb98dbafba339c593dd3ab2. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/INP612401119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcece8fdfe58d57b4afcd7bf7e8b2d961df2f04d2eebc148b55f51aa11f1340e9. 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/QM6P42440600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ffc4bdeba8353a9610a6b86451e22ee38188c2ee7f0b7475ad434ff19d4c9d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/INP612401177.