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 0x523899dcad5b71a810e9ad8fbbf9276bcb5734ac39aa8ddeefece0b65a683813. 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/2e83967b-a85f-4dc3-baf9-3c452e3ddcbb.json and https://artists.proofprofile.net/proofs/artist/2e83967b-a85f-4dc3-baf9-3c452e3ddcbb.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 0x63386b2016ccca9ca4763ff21ea65dcdd6d4bb8000a46c7632f2ec3ca59253af. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DES561926503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbc6469955fea49b5391bf6b21dbaefcfaf62c13a76f41c3b64dc1caf9941a1. 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/DES562131701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c59d003f7a3cd88f004322dca4a3c12bf37cfbe1ef5bc42afed4cd586a20466. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/DES562131702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9deea5de480020215c81efc420bd777307efbd4c2677f90c4a04e9ac15f9fb7e. 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/DES562131703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95392924a5e8b0de1f0913903014f66557dca45dd5f6ebfcb3e41f74dd3206a6. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/DES562131704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd907cbcc1105f2315eb1465845a2dd65b371d9858883583305618c4ff176bac. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/DES562131708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89e589a04f1e0a3cb8882e4c9d1ce815fb406fc42e80ce396d20bc7c27d87e8. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/DES562131710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfe3739c31c3b29e4054cb9faaa8fb37ef8f25f86249a4d3e805cb6897eacc3. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DES562131711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237b7b65e4295d73db44a95babb004f3a46933a6996bf1d6d9eca512ad54fd35. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DES562131712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd4a906e529f59671e53e6bf38a3e169dbf9280301c5ba00f1e3bc7b8b9ed1f. 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/DES562411318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea5575263dc0cad61b4955b237764b74bc4c09cdf95733e5a7f13f5b668db49. 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/DES562411319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae23ed650e4038ed097761e5a5003ac5807f11e3500aa914031e5f131b33b0b7. 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/DES562411320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3d3c6a068ba4000aa9bc5f39bc3faa6bc7445c8e4ce9c0facb47712373f3f7. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/DES562411321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfa16b5a52ec8536c64fcb1d058ca51990b99c42c8910d9ebe37c2f763fa9b4. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/DES562411322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0993911820c3c155977a2295ae773eb81df9ae9202d76f05a3adff40762395c. 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/DES562411323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d20024ead397ee92728ef6cb4a9fc70ac4dc467ebee5d759c1bd63adca88ce2. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/DES562411324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842f8f1246eabeb559c20701cdc7eb0960dafe56225fe61a98fc2303edaa7c61. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DES562411325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf774ddb0bbfd4ad07d06eaa7cf4477fa997496811ac204e2cc5a67960c95c72c. 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/DES562411326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a483e2aa1f52035fae841de9655b6a24801b5cb670b99f2886aeba1b2dae3ec. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/DES562411327.