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 0xc48df95f81318a74eb94d437deb1857865445b0f9b8a634bec3bd9eacdb952f1. 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/54ca2145-531b-4bfb-b666-d2f372f6b570.json and https://artists.proofprofile.net/proofs/artist/54ca2145-531b-4bfb-b666-d2f372f6b570.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 0xd12e3cf8fd6d85dcb139d4cf0d837c453e520423b183a4523d8cb9ee352d5a25. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/US3DF2232843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc70582260d55288bf7539c7aa2f01d57429c542dc16e1a19093aac512a68be0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/US3DF2232840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ee98cfdcd0212aead1dc075981f6a37bd02ff82c4edc48867e344db4048cf9. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/US3DF2232837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12e3cf8fd6d85dcb139d4cf0d837c453e520423b183a4523d8cb9ee352d5a25. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/US3DF2232843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb4d8f7c261e6c26552831e39165e16856bf153d46dc71148f079eff55a47d2. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/US3DF2232860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee15396f58d31fd0fe1711eb88cdb72826d8c8937f4d414efac50232f8f8f8db. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/US3DF2232865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf77862e4826a74c9ceb060f971e814484f26cf8fc706fa668938613f62a2ee. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/US3DF2232866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48876954d1952c645160e4e477466bff30a59693965d7c9001870c652ea81d1a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US3DF2232867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8409bd1eadaab59610e079d01e9e601c1ebadc5470178f12b8def1a43fd651. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QM3DF2213160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7698f36c5c0ac3081ba4fcff24ef214c268ad9acc57a1c5f0b198995d95a0b8f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM3DF2213161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e786a3352baada735a087e8758cf3825db6346f0b5f43a12fd68789d0fbbcdd. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/GB8KE2318320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb6f8df8c1889f69b76f0bdf9a71112eaf9a759104724e76d78a6d75f9aac00. 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/QZPEW2449367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a14e37b04372de2b8f05d3c4c7eaf432fb2ceed1ed8e58c4e5f22f8dfaecd2. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZPEW2453223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc4260358d3f8f24dcfce1cd9a78e83f7d631d9dc9ca2d7b7fe443a820e3983. 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/QZPEW2453224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dae105c92265d8d1d4b88baf17b555f6b4419d479c6f86a9a6721f7e9bfb0ce. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZPEW2453225.