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 0x82b3d69d67956e4bfe30f445c533e8ce2a4e6c66eada930079783a2f3bc4e414. 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/d032c3b3-554b-4df1-be85-80ebfe06d799.json and https://artists.proofprofile.net/proofs/artist/d032c3b3-554b-4df1-be85-80ebfe06d799.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 0x59a9374c023a0f7895d739c489609adb000a5323e408f6e594766a2694ea10a1. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USCGH1907601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dce71082d2d1f05a34acadde6b0f07e1d9022b899892e74c663e6e8a7566675. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZDA62056325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896cfbf873c6ea80e35bf65a57865657011c792b2b3848e36c36882545e64302. 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/QZDA82072144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd533ba82fb3f47d6103b637c44a498af2386c4ae4a6232279aac7f5a5cb82980. 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/QZHN42050295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb48b2d45daeff82e4470697150391238bf940043069f13cedceb2f144c08824. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USUG12004344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0cdf46fb8ffe1583017d56943395bd3f4829af9be79a4160d1641ca55f3a6a5. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USUG12206950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda68fe4075f5c3729c5ddf8cee40f0618026c6ead7b51803f0355fb18fa294e. 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/QZFZ62309392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cbdf976f9c0daa5f61fc104542d94474300c2b503cff72c7b5a4f91f22fc07. 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/QZK6H2347181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b26fceaca873f97cfeb739309b53895b3095d33c74b332d9e1d9585e836ed19. 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/QZPLR2392511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71372a6bbff085d43fbb83356e80a27df4412f126688888d456db1f892c93e1. 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/QZHN72433531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5d89213ed476f00c6349a3b8a72f8c43cabd0a3cf19c0bc3db2bacfb85fc09. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFW2417513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74400cd550aed1e9c1dd8aad8ddd7ce82fe4abd8a3f66e25e07af3636c35f54. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QM6MZ2579783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09e005f8f4fde9d86310fcf3471d9d2754bfbb7c26d668758d1fd69543f2881. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMFME2508806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6cbd6fe57c1791332129e439837687ec3706a4735c189cb60f15f1700c53b0. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMFME2508778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db9733b04fa67e6eb3fee82d6fe11e085260d2a0bb019d4f6ca4ef60ccfe528. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QMFME2180340.