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 0x5b2039e58d25b0014d3f19fa860dd6b316347f2a47710d2079850e1acd0d5e3c. 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/1b75f024-188c-4911-8875-c390b958d4d4.json and https://artists.proofprofile.net/proofs/artist/1b75f024-188c-4911-8875-c390b958d4d4.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 0x0c565fd9039ad84cc0b4eaeff3f37fc3530795f0b73bf7dc19c17ceb8bcbbbb3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITA618606675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d80da6c0787b5f243a05c75378ef7ac9f226ad4decda335db82b05d5ddf6edf. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/ITA618606676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbe279c1e94bc1df47dce834d8f82abd0a20fc3eb82e6a7f2ac500d95d1d5b8. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/ITA618606678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca55be5b2199fc9b2423a4fe948c52cc69706941ac68dae10886a8d8956f02a. 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/ITA618606679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66641d5e346b69ddd280c9f881235a3f8a3036f98ff8c8940f1650343f24b461. 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/ITA618606682.
Canzoni classiche napoletane dal quaranta/ottantotto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289d81bc702bb2b6fa8bf16131e93bee058b6584f00125e255cb2604de51387e. 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/ITA618706689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0e7041d8dc5495c73ac8ca2eda02f0f00c6b76861e5a93a73877157fa0a6cd. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/ITG019804277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c1b6bf36ae9e1aaae3cf6618379f42d4af44995d4baf6544cc07edb88fa1a2. 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/ITH471705601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1596ba032212b31dc507778eb30cb5128ddbf7e2ac045d6ee5762240879edd3e. 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/ITH471705603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b440007dd7e9f40858e4345f611c78072b42ec606f3cceadb43182ec8a5ed16. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ITH471705604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2d7fafe61b32bd6af9ae94b9809744fdde3807ef415c599fcb755461f9607d. 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/ITH471705608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c0a0bed59e90c2e3961d6be233ee5c055f2c3265c839b427b690862a44cd76. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITH471705611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1371926bb4554b5b73f0c0d489c93e4fd3e1fa8fedc17264d48fee8e568a3e7. 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/ITH471705612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3798088abc5a52c582b55410a08f7009085f229d61f0f1d52aa3448c616e6d9. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ITD651332202.