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 0x9796e5dca59db210efca3f3dc1da69b99471667609b2c0ea7b120fdeb5a2ed16. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c19ff1f4-1b0c-49a9-91f9-268bc6e33728.json and https://artists.proofprofile.net/proofs/artist/c19ff1f4-1b0c-49a9-91f9-268bc6e33728.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 0x5db56a774f72ca88183765b556a45e7b04c52e81e18b513c0be5044440251995. 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/FR9W12218727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33429d79b6e9f75eecb4f2ea782d5813bc09a6df7801e1d4109a60328a74d51d. 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/FR9W12222645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518cfee248a12920d4f20c37e5db000c01676b85ce8f8ba651bb0d6cda9b6ae0. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/FR9W12226828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523143e82623d947c72dfd3cfaa767143d401307ae460ceee4315aa4e1fb3385. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/FR9W12237334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24606727d34647d1eefd6be9ac2121b26f760c46cc20e3bae2c2e196eb839531. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FR9W12234709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb69aa4287bbf88f393412783e631237a5763699e644ea2c9ee56aca76ab4eb. 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/FR9W12246244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e7a3dfa2716096d36c8805c0131129c2e2f1eb27b79b4afb64a24d22cec7c3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FREBY2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56bbc596c03dc748a66ea0ee112e4e4768d9e6eb91138c6f16c34d87dca646f. 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/FREBY2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae6349a5241678431daa489f5b27fb07a9efc51aa480d8645aa0bb9d15d3c0a. 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/FREBY2300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd47015a26471537d05384ac4f78dd2667e28989dd183e0171d4eb82a9388947. 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/FR9W12245241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35c666f59a863057b3258c33a3c6590d148b9f91a56f796a6137b3220d50d59. 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/FREBY2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10931944c255aa06f9400b1b201118fe59d095339111112868b984c501aecd1. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/FREBY2300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50eb79f827986e2321183b28da892ddf4c4e9c0be3aa752e2f68a082021695c. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/FREBY2300090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10931944c255aa06f9400b1b201118fe59d095339111112868b984c501aecd1. 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/FREBY2300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e093cd9760937e1d510a1cf87836896a30e32b9f374c98e2287bdfa2dcd59a. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/FREBY2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b204203ac96853da3b2de9b2bcdbd99bf698d730aaa2c5874d3e20f1b1883d. 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/FREBY2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66134acb863b778377ec0b0bdeadf484f11fcc88ade99d294044b10b1b1c3c9b. 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/FREBY2400030.