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 0x98539b7740c886b8dd5c3300b20b330d06f3a6fc2a2c40a5d425d574a1c1c536. 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/b67a719d-8045-4ef2-8c54-43e0c1dfceda.json and https://artists.proofprofile.net/proofs/artist/b67a719d-8045-4ef2-8c54-43e0c1dfceda.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 0x9da5d456ab95ac6afb2ed9737e274ddc0e6097a6b72c7b1f919fd74a8d094482. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/PT4FG1700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb75045e00ce11c703072b10e0eb2dca14acfc99ac0529522926c705233718b. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/PT4FG2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52df8f460ad8a87fdc9bad89d51094eae9aacc0d10aa930db3bb5b1de61085e. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/PT4FG2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657eafa7af289f9e59e72dd06cfbeeba20ede5569c53e4c3569610372da91517. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/PT4FG2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c31af0f9802f6c0e30a09b210fb3a4e3a937f3c03fd62182c1acef828c7d4e. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/PT4FG2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd550eac0a471cbb6e954051dceec787dcd12a45df4324ee1a88b702730f86380. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/PT4FG2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a775fb42fb888ae7cfea5fcdcc41d645dda46f415cee5a3f9a68682535727d. 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/ES71G2143432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1fc683f019f51c40ae053986ad970fcc34aac322a03fb53a233a43c66a59e4. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/ES71G2143433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b24eacb9760f09da9cf478aedf79e79b51aa69ae05f61a83ccfbedeeeb67af. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/ES71G2143434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1617febd3e92573a28aeacd5946da53c98ef1be7f8d47a4eb916bc3846557c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ES71G2143436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6888528584c8b51af7ff7b025f678c521e7397a3e8c9d1cabb162c17ef5c582d. 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/ES71G2127289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfec9f66202f02997185d9d4fc22f8c9fefb215a32ebeae57f7e4ff560f3719. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/ES71G2314828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d62972dabb77eeda7d9fa7c2703ec69c357ffbe8dd1d3d70a14ad7c8b04c8d2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ES71G2333597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2ba260499129cb2b1c04424265d6c89d1cfdbc1c7e2ce5cef374efca56531f. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/ES71G2402177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe4aa6d6b7636edbd92c95d9758ba7a966a366801483b6846dd88ab59c185fb. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/ES71G2407783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcc5c002f4ccd0507f7a0d3f7e7c074cc895b04cd1ba0a233787e3a7be89954. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/ES71G2409634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8032ef6f5c0713275d3b96afaef24e8b0bbdbc4f78929da85b8d97a36728f1d5. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/ES71G2409635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d787f087941f7aecd3c74ebca203a79e2633ca4152de91a6c9f267dda3b5bb3. 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/ES71G2409636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d62972dabb77eeda7d9fa7c2703ec69c357ffbe8dd1d3d70a14ad7c8b04c8d2. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/ES71G2333597.