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 0x6e16dcc59a99050518bb37fc8e015fcbcc7181c2402c2fe0187623bf26b8df5f. 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/6e827697-a954-4a01-8a6f-414cd56ef5c1.json and https://artists.proofprofile.net/proofs/artist/6e827697-a954-4a01-8a6f-414cd56ef5c1.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 0x44d43ccef8bc0dafa4c081ce6a59246a2c2be5f32e6c3b6bc6b231504614176c. 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/UK3K51300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6a369171d23756786934204d53f4bd71ca98146fc532775814af39c2077841. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/UK3K51700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31de1e0fee57163492e4f6fa54e500deae0888f0abdafefa32de6f10e08460fe. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/UKWX82100481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102e704f6ed172ae790260bf0450bd4b75e3b1473ecd14585dd1b481a355ebc3. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/UKWX82100482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b20366ced451d9d051bc045dd79a1061ff107d3814d7bca5405f852a3f68fd. 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/UKWX82100485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1102f573ccb367c8ed0db913f404bb20e26e16035f318ffa7f495f198ccc82fb. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USZXT2352913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d844838bf5ebf5df881acfa93f96056d7700ec2fe59b4a1d60cecfd3baad82b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USZXT2352914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7b92db1e7207d848a9ba922ba27070b96d1f5130eb6aff70ae581235d6bf1a. 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/USZXT2352915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6eecc290f4b179033adb66f7644864a1cdf94f2d0db9d9d0627cd9d7a12f4e. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/USZXT2352917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9183631d0eb81932132958d6d25f8de6f7d40d05104618aea4046400ff9ebda. 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/USZXT2352918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c5c50113cdf4c956144bd9335e9ebad138187b86dde94f09ae1179529580ca. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USZXT2352919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a27fd11cdce81d9c069474aecfab5df699cfbddd2870f1db632a4f4300fca7f. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USZXT2352922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e89b56b1be3ed02cf2086598c9ab5e47a7c3de59370625f09354a05d2bec53c. 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/USZXT2352921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfceefa64b8528a24d48df44c65a1f44e641d8b147cb78eb8bc600868c4057898. 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/USZXT2352941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c8ecef28c3484fcc04a406a1c78a5c6a37b22b85fd9e7549d447962f75d456. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/USZXT2352942.