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 0x946e50fe3f92893cffbdee16a3b5f2cbc47c572a7fb53c2b52ecf70f9123d9cb. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff552a28-8788-4dc2-bd8c-ac5c401558ca.json and https://artists.proofprofile.net/proofs/artist/ff552a28-8788-4dc2-bd8c-ac5c401558ca.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 0x8e117bc8fca6f7ebc229a31db863a33a9b0fb65978f703995dee3baf3615f2ae. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZTB52329851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6274beb49988eeaa5849cd34c1f2eac17bca63c80a74cd0e6c1b09429c530a. 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/QZFYZ2468217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1a88ffaf9c2576fc5261b0dd0787fce407d894c3d35f6b3709fc44bdd89e87. 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/QZTBA2339286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d217ca18ef326528fb74861567f78e49080ef922d7d9bf9e769f5986ec8c982. 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/QZTB92320104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e89516bfded38a3c661ad25e5813826080cbf9c5f15bc1dc85974e1629ce5b. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZTB92318373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22af1040ef0d8496ab83ff56a97ab34054754c588a994315936c4d57f4bfbb2c. 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/QZTB92344798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f99e30466981c38ec2bd9dc16aa4c13da5d41addebbc8ac012bc71277deaa6. 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/QZTB82337322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9f5a3f8d5e57597bf31cf995c234f36baf404e88858fec18cf8a3097b81b00. 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/QZTBA2339337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631c40e98194725b66f62d8fb1d9a1543e9dbac3dd2f4a4447715a3e6d2990bf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTB92344763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5ea56f473121454ad4d4b5286a44082c92bfa254c6e56a95093dc583b36c37. 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/QZTB92307341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c5fcf007eb67da6a7b3750dce449c276fc0562fca70c8bfdc108acdd1b71d0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTB92344775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c2b6d0f5c6602dace9a6537d0fe979a88eab63a0c91bde06d3f135657f1af1. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEUP52100411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912defdb8eb65a55926f531b8d0034b96388d14898e92f05581ab2ed33ba1bcd. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEUP52100414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc930b0fa6a6bed9b96c36c07ab2fd7d10bfca543fbfb36fa4997df5a4404cee9. 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/DEUP52100416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2415bd8114d8a5c7c93da65f3ee5c4c4db5e23708bedbd4409c0b471bf2df3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEQ021904611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26eb69c72dd369486b287f0ec9496ff411861a1d836896c563c8541e681c7699. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEZC62441216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26084006ab1000c49761cff77859984a7a50c776097c1048b5473bb20692fadb. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEUP52200563.