Milan () is the regional capital of Lombardy, in northern Italy, and the seat of the Metropolitan City of Milan. It is the second-most populous city in Italy after Rome, with a population of 1.36 mill
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 0x556967173e565b50621d14eab9cc063b638c7ba873aa3d9f537b223880d56eed. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ee7b368-1060-4e4f-8dac-f2c409bc5081.json and https://artists.proofprofile.net/proofs/artist/4ee7b368-1060-4e4f-8dac-f2c409bc5081.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 0xb2c61ec1bf9dc8cffbae4dfa57b1e31a63bec2bd54ce954816142186a9187c71. 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/FIJAV1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ec034b8e8f8b74b6ce9352bb76c657a60bbd79d96a33d160052d7a8f3b8544. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FIVKH1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0061dc6e8123329380d5acefe97ec39573b3adf4aa347c23bbd3dd90549dc42d. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/FIVKH1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aaf75bb8a985620fde16887c88c627c9fd5c21351dcc0103eb99303dd133a8d. 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/FIVKH1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f067069ac561e79e1b4beb8728c95c260085b54bd7798c2eca34699b218cc5. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/FIVKH1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d253cf1ffca12aedcaad2db6e202feb516489ee69c51f30e5b2d9732c8080b. 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/FIVKH1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e7cbc0d53211ddd5db668303e9b3b61c44f9b51810044001a7bdfb0eaa5392. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/FIVKH1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e202ddd444bafb772c75db4d326754f6772635f5d320085496a38cf5280f35. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FIVKH1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257e6121ae700e03ff2717dd58a749445aba07dd20b472bb9ed9bca3929eec64. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FIVKH1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a67b34c5ef795baceaaf20055b87e1bdc25fa5ac29b58690cbf6a74071ff7a9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FIVKH1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7486290a76f65ef0ccf6a29b15b705272dbfcebfee5be0ad582a6cd88550b79c. 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/FIVKH1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe08fe6f6eb998777153081df30b9ebe55e9f751e790618549fea8f12115b973. 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/FIVKH1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c016899f3e6608d06fbf6fbfb0f7896ed401e9e21f699eb0e45ca280d8e761. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/FIVKH2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164afd6714390dd4f6cce91321348909d645dfc8b039336a33333a98e8aef5ce. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FIVKH2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c821aedddc40b2035b432b7109f635e3f86846bf959bc3678432cd7bd143ad. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/FIVKH2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7f6fab68ad1640ba6243f1144416adc82e491b9a17e75a83acb59b20c700aa. 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/FIB2E2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3802b7a457dc590ddfaeb3ee81950cc8c811dcd84a487f93c4ed2574b3014af0. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FIVKH2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62dc49c385ca52f5daee80c4164caf8c64cecf7345146ac0d5539b70cd7c2c3. 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/FIVKH2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05471e9c4c76f1d1c39f6717b7f7e85224239601ec81c186af333512a9cce6f. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/FIB2E2200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a88c66070ff7f44c03ae78b2ac86cb92e0f42eb662f1a5915a10ac307ae0ab. 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/FIVKH2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746ff6a01a006be8189126cb744543e059fad781910387dbc37f988848814654. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FIB2E2300007.