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 0x6c7b314dcf64b5e02def9f44307e0943082a5cf00e42ed947c0e8b21dbaa70dd. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e0df581-99fe-4a71-b9c9-d86ab3918618.json and https://artists.proofprofile.net/proofs/artist/3e0df581-99fe-4a71-b9c9-d86ab3918618.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 0x584ed7b210be7e22d232456f51421336b4a0c266935ba535d276561263f5f836. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ES5770604553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20af4c9e3ffeec1bdc64967e2ccd5c3af42d146aa7dba51374bdcb03742ff62. 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/ES5770604554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0739336d5378bb260941d57f7c55d6ef8bc1c9c19e0213ab3ef490a070e6a51a. 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/ES5770604555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea212bf832d23f5c81d495192dbaa701bdfe3ffe14e9c09582cebfc3d8175ad6. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/ES5770604556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0330191e343bfe347140341280b3f6ca97ef53aef84797853529284cbbc340f9. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/ES5770604557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb07312e05d126ea207a7c2feb5b07fcf1a495749bef956831d231422c046626. 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/ES5770604558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28250e6ec5c520cc3f543a01cdf1a4673fcf0f39c7cddab8b25dbcfd10f6dd48. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/ES5770604559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2af8c13d35d1c23472fb9a09fa64b8c82b4ba7b65f4c0bb0bbb6f089421010. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/ES5770604560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1023f2ed35266eff3335aa068c2a1bc75f86836cbf57fc10abe9296e12ce9048. 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/ES5770604561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba6a964fab900e14c5b56b9e59e5457bf56150e146d8e06f6f0f09151ecfb0c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ES5770604562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03cd93f144c8e9b935382bef3780e72e4cf00d0045611b7010c17c8a3db24977. 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/ES5770604563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6dc16801ce98f396db994b6ec03f175093155971640c3e6c02414d765e50589. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ES5770604565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42ed91dcb2ee17148e77d463c9785ed46d8df53111d48e0c4858e2abd77f512. 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/ES5770604566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882cdb66664052e61befb0ba9f3ed6c79fffa478753540e279bf19b449fa92b8. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ES5770604567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2078581e963dd26abd034742a58767142fc19f7c2f5b3752e080d0e88c4b2dd8. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/ES5770604568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d3dcd4ef14b6c7064b888b0b9a462bc68f022816d3bc5837ccdf96b672fb7c. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/ES5770604569.