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 0x398755438e0edd5a68be783338e1baa03e5f947ebcc577cf5e49092232b148bb. 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/2f5da979-6c7c-4dff-af28-0483c5c86f2a.json and https://artists.proofprofile.net/proofs/artist/2f5da979-6c7c-4dff-af28-0483c5c86f2a.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 0x0c201907b2e537cc9ef0a567543c725bf1e4fa62be5f7b530f7a2a46a617cf39. 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/GXD7G2408227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd548f70d30b71ce2d24ea89ffe969c48f31cebfacdc7389b5076e54368f2e76f. 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/GXD7G2459073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4f37385f7fa92dc6307dc9a24f281955c4227e007ecb8789db2feee124bd36. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/AEA3A2361184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062fe09a65868b406e52396fc19dbc3a888f561928f1bab0f667b41911b84f6c. 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/QZN882402837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646f6e39d7482b960155f694e3cead380b50f7f886de970380e68d8acfd58e9c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BKVYY2401888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b74500349c3e434619d16c4e8600262830d331c609a9dbb29a5c85b0d5a6f5e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BKVYY2401889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b3accfe4f5fdfd1316eb5e78bd25e181b6fe840c6d6d7c6df0b99b64f2b26d. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/BKVYY2401890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f87f4c84a20ff26ea28da57019bbf5adc5ec53c24da74135a77ec7c574fe682. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BKVYY2401891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fe842d655770da8e9fe9c5977b1af33ec02ed912ba1aa4f6aff1a625f2daac. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BKVYY2401892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b15ae2018e91bffb0410d0ab18b2687fe6d7cff0814f5accacf06a0c062e2a. 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/SGW502260661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4643c23ce16b0c3b6d0ad2106a7a39df2b1d0f69eb0494e284570991a345be1b. 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/SGW502269329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5892aaa5fa7ab9d3642910f43ee5a06bbf4097e9f8505bcae16a833aa68db3c5. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/BKVYY2402123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdaeb61cd17661904db52a7f7cb0dcfa966589451279c0e471b2dfd6580669d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/AEA3A2599489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5aa24bbf5d0beed250364c9f17f4b32b7be500a731a6aa47f80d5315312e1d. 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/AEA3A2556462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49430ed7f6b3bb580853c552d76835dd609313fae0429f9c2caacb427ddcd613. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/AEA3A2512871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7467f6d0787d7c20502cb44b63193ba90ab3a20cbf572a4545b2ab9f57ff0c23. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QM7282531328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309feed16d578fc4ec617f362bd4165f553d92e67a73b89cee773f3b2a8d1b06. 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/NL3M12514214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338b28186b036a602869d54bed33b8db1ce61308002f566009190c78b534b5dd. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/DGA052508047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b62f8bfa5f7d7b091e3e9b9389dadc957a0c4f8b08d36207b76f26d502761a1. 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/QT5M42501101.