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 0x9ca7f7c126ffe5216ddd283170e4e933c41b41ec888e99ab659e1dcda83c0bef. 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/d8575fa9-9eeb-4e1e-b228-ae0fbcd32df5.json and https://artists.proofprofile.net/proofs/artist/d8575fa9-9eeb-4e1e-b228-ae0fbcd32df5.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 0xe53b63212efca8bbe8690bee87f1fc347af841ca19850c72d8808af6ea5dcc53. 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/QZHNC1933664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00e4930ca0613fa3bd812ac5a8ac96f2a54807c73b0a4892443df319c14ba37. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FRX452090568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8698d7f093acac305d20dd70b0609aed294e6c0b164a2d697c6edc976340ee99. Chain 2 (Bitcoin): anchored in block 957728 (2026-07-12T16:20:40Z), 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/QZNWZ2081398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad788924ae8e1888f71a414970a97f0747d8a1ab0759a75c7449abf6149d839. 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/QZMEM2152463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bc1a870c913b3fa3c08aabeee8334fc7baf8c8a7df9d1f073b0c8468bb63b5. 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/CA5F92300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfa0aa40a729dfc45aa18fd323e8c4b62f0033eba6abbc09b94f3bef963d980. 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/CA5F92300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3fd8cccbc9600b397e1eef17fcf904bcc952aa866a389374d7b00760a9331b. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/CBBA82200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bc1a870c913b3fa3c08aabeee8334fc7baf8c8a7df9d1f073b0c8468bb63b5. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CA5F92300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbfcf9894de00b1dff846ba192bb9b820d8395d81dc35e41e759e76ebf22301c. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/CBBA82200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43710d7568e1353202cd9609ef4cf8c2a22ba7fafa6eaa395d52843e64fcb77e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CA5F92400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc22d7f7f05b5a0021e776d522f505ef4a30b5f7f7d12405e5e18fb880db8002. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/CA5F92400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc023cfa4235b06c75b7561c2b7428201e15baf5b16ac63ae2b2b16d685b8b6b0. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/CAF592400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c33382cfde8a7c8ea21bc2d5c1c86d763fd70d739560f239a526b0b2acac37. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CA5F92200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c33382cfde8a7c8ea21bc2d5c1c86d763fd70d739560f239a526b0b2acac37. 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/CA5F92200002.