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 0x344a3fba242cce217f2975cca5bc90ff6f7fba65e8f5045d5cfe1a4ac3c657ce. 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/1dc85c94-09a9-4a98-91e5-04abd3681c76.json and https://artists.proofprofile.net/proofs/artist/1dc85c94-09a9-4a98-91e5-04abd3681c76.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 0x01f174c83ed17c2220cd8cdf0808903bdd0c0ba1e36e774f699b7d1fb8bc4b0c. 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/CA5KR2362739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa609b2767827feae06f4e3a6afa5ff0613b5ff9c27977526a3e747f99e1ba62e. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/UKZGC2308453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f947937b470fb804ff27ff10f9f200f35c1d6c7eee95f83ae3dfa19d2f9bf77. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/GBKQU2423351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1d4394f6e10e2fc5672861c986421e5cbd2e4616ca1e7b5af586f853ff7c44. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GBKQU2423352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05676a8ac88712b96c1c6450778b72ba1644702fc7df86b5c90bb36a39822576. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBKQU2422016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a19b405759de0dfc54443043a1c96a14238a85d3d46f241ad35781f506663d. 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/GBKQU2423941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125addfe896091e73364700db058998bfdb428853072eb6076f1b4bd099f1f1f. 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/FRX762413390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7119501eea8f4d7efe105f8b32483526f416f3eeeaa0a2e5c5749fd684b0b2a. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/UKZGC2404227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0835124599ae3e062b3348b33eb201d3bbd9ad51c49f0fa87b55401919f02212. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/UKZGC2404228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93753a35e979df4f244933381edf355e94c178d5bbf3eb892688f75226bb6d9d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKZGC2404598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6a8c0e56b257f8103bec8f4d0b08de5fd3de01fb3525c8e0d8f808f423ca2e. 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/UKZGC2404599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f81c44b3064e8237abcaacd74b22039dbcd13d3369386ed0a46e452b42a961b. 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/GBKQU2449822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22706f2fbe1400b30896c633ded514d46447dce8aab1893d8e6d50cd7b388cdc. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/GBKQU2439905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dabb36aa99df8ca2ce03ee6b7ebbe4a2bf1b05ab52c7557ec590d486055456. 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/UKZGC2406801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed2c0997f34fbdfa44db84fbdd3e2ca0d45229f198bb06dbd523db9b57f9cf1. 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/UKZGC2406802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8da2bb3c39cf9f24d6d71e332f767711be84cfee7d27ca2cb0916e259e3a12e. 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/FR2X42596526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5db82bf8d41fbbbe66200d1e92486511883207f5712b4a983ce48e529a37fc8. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/FRX452530365.