Signa () is a comune (municipality) in the Metropolitan City of Florence in the Italian region Tuscany, located about west of Florence. Signa borders the following municipalities: Campi Bisenzio, Ca
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5626e73e71375fdd65d7630ef26af037e3561966c9f467152f74a8b90863e2e5. 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/4c770067-9713-4b70-929a-468bb1bc57cc.json and https://artists.proofprofile.net/proofs/artist/4c770067-9713-4b70-929a-468bb1bc57cc.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f75b0b732f845e066edf1118a37f758848fcbe5fc9f8588dd4fa455529ed03. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/QZNWZ2110737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ffc531988403f3f7b86f2108911b258afb3acd606f61154a9b793cbb945771. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZNWZ2110738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f1dfe6af325c529bc69b848dff4b6cf13817ccd95a502767f311b9c3be12e0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZNWV2281296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae968793a62a08ae6c168d5c98a868096880bc4beb9b4ba6b90d01ae09924431. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWV2281297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dde46b5c231fadad23937b8244a45c428ae1c58deff398513ed0bb9c1db0a7a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZNWV2281299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28de82b6a1def48970b99dbc3566284272930c9e3de68d7a93c07d5d7bfa307. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZFYY2465141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d5f4e39477a3beb178029af59022fe76e8a80ce3f8c63115aecfd8ec583de5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA62481785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d073da1888061a522f071821fdec1a96972a2c55d42776658783e112643c2f. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZHNC2415977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124cec7c0a8627dc8edc372b35d78ea1f26435f99968598941b4da4173698ff0. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZK6H2459543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1cfecc84cb6d1d8b4a40480f0cbccb7704d5f567aa2783305c61a91bd424a9. 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/QZNWQ2444463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77771aec110d306a56f960db48962f2925ee427701ca63db36533543e980d6eb. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:08:42Z), 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/QZNWY2484602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57523a606ea121f08be6fa731cc3dbfdac1d381dc539f955e85b632b8fd4e6d. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T14:03:48Z), 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/QZWFF2417343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8092a43ea1ed341252a492d79b12a032acbc1facf8db32be56e6014bb6989381. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZWFW2441772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87555ebffb2ac6e32e30ae0a8e38f39d0b04d1aa21a74bcfdc0ead6751c73db0. 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/QZZ7N2423684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28de82b6a1def48970b99dbc3566284272930c9e3de68d7a93c07d5d7bfa307. 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/QZFYY2465141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d073da1888061a522f071821fdec1a96972a2c55d42776658783e112643c2f. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZHNC2415977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009e0adb338bfd2c84c386db0e57181389f712d72e9f818948982cb3619b4ce8. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T17:53:16Z), 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/QZTAZ2488083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87555ebffb2ac6e32e30ae0a8e38f39d0b04d1aa21a74bcfdc0ead6751c73db0. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZZ7N2423684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd622f9920d6dac970fd48be2bc3591390c0d5f329a2b6cb790199dcf2900759c. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZZ7T2599438.