Dear Jack is a 2009 American documentary film starring Andrew McMahon, the vocalist, pianist and primary songwriter for the bands Something Corporate and Jack's Mannequin. The documentary chronicles
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 0xe4dd8a7cf8e212e473d12613602b922d8407636ca398d2d149c2e59793952839. 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/25f17a48-a2c2-4d08-9668-83e92fef14bf.json and https://artists.proofprofile.net/proofs/artist/25f17a48-a2c2-4d08-9668-83e92fef14bf.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 0xf97a54eb4c795971798b7e1128af90fc4a406662691a3200ebfd7883d4010901. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/ITF131400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ce52cb345a172e85df0cbdbb89d141acbc1fe1819b95d28dc0ba298dfaf3e8. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/ITF131400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47552899ecbc62d2377db74a305fadca0f4ff6903207eea05ed34ffe8347628c. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ITF131400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd592f9b68a1adc5d190b3f781854fd197a5177d78772afdf378e48fc35810eb6. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/ITF131400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402c2d88f2eeab3afd109ad8b1527e32d19d838839e103cf7a22acdb137054b8. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/ITF131400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f80afc03a4deacd777914ce99f8de6288a66ca036cc9c6e6a8335392c62aac8. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/ITF131500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff08734e7558a9f58b9194dd4ff5f9a491c1870d3d42a27219d0f62ff9f1ee00. 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/ITF131500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8abf18310bda6fcabedc2f9f468e5a61f73eb5618761fef0539d9f3eed07cb5. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ITF131500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4251cd5b8bd486292d61fc0618a558d13dc3a236ad9b533885ff1a35de3290cb. 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/ITF131500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a1b2454b57f0046b86e89469b3611ea5fe1b26d9514476e55e4479d116ba38. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/ITF131500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904909ae19e67c289443e2954096fc150240a3d55ae75e37333ba380632b5d49. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ITF131500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fe5b7dd426bcd52ed1ae11dc077351e0c3190a46dde019ea9ef90bf2731af4. 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/ITF131600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce819bb96928b5e2825457a5c30a9116678c3e96253408717790de9bbf9780d. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/ITF131700018.
'A città 'e pulecenella (feat. Dear Jack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1c5b9500b2ce126e6fdb814e0b16408c7c15a6566e5e26d84e2c24dba266fe. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ITN851500021.