thumb|Lunch box and vacuum bottle owned by Harry S. Truman thumb|A collection of lunch boxes for school students thumb|Insulated thermal bag with ice packs A lunch box (or lunchbox) is a hand-held co
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 0xd2b70f528462c9dc5fc63de44c132d9a2b02ff55670ec025fb8ea7627e76ade7. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9bda368-356b-4100-8dba-28dfb69b239b.json and https://artists.proofprofile.net/proofs/artist/d9bda368-356b-4100-8dba-28dfb69b239b.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 0xfc32cdd7db4783838be79fe162575b85c7040944a5258f5340d9951321bd5c59. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6J2340691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145bd5d1955c16d7d574e3061023390a207671511afdd5b6020e744a3a403d04. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6J2340694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7266e2d9558d821bc2792fbe5b83c5a216f38bcfcbc074c5537ac1577f7191a. 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/QZK6J2340695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a028f429505ec4cb2b1c4fe883ed5dd85d799f6dcc2c1f9f5c511df1fa00bb2. 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/QZK6J2340698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498f6e103ffb54ac15e49a5099d0032402258676fa6ac6c8df1c8e1b4d0ecf6a. 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/QZWFN2394094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2e6f33325307785ab3cc17e6138ecdbabfd2e34e0f2b3d146ad6f02601e5e0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHN62336632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f012247633831706818be9b5cd5fefd333897299c429cbe25a4a5a74016afeb. 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/QZFZ22313289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d115b487865a6cf4b28e6f3435cb892017caac8834fd1289b444602d68f5413. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTAW2242046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf026769d15045f16faae8ecc466213b42bd17dd097610cb724a225fe87bc7fc0. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZPLS2215430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86477f9c96d8d81d96566ebd3bb87b1ffd9958864832503d2aedec21df2814b7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6L2494234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311bb4fac79a95c1c70d546656f02068e34a65638e8f63777f161805adcae6a8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6L2494235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f5d6435b1b6ef298298fc2c10a41c4e2cbf3fc224cef50f5ea9ba9240da755. 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/QZK6L2494236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512ed1e1ecd1dcc864e1621fb5a5ab56a1e080c01f06b26fc8fb7f784d7b70df. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6L2494237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4650bd9c9a6067c81e842ffd12dc7eadabe68ac42b00f1d67f71611b322cd9f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6L2494241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0586ddbdb8a2201e6f9b0df9044c72f37c1e255d954f796b485bcd1efb60ef3a. 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/QZK6L2494242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01a027d4b6756b5389ba0139cf33aeec3758f33d0658c7c2f5c44c38168fc66. 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/QZK6L2494244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c0282c3cbbbec742030f884c3de06831dea19b21e514ddc7d4f9d0f8b0b5fb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6L2494245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3ff479754e85518b94b7384c3d7a2f520cec5ff26f7b20a6f4e427bc189aa5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6L2494254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd286c39ba98f0794d1252a5fdad54155b22ca142016f990c687156a149f82b8b. 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/QM6XS2510998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113ee6223e68f658de23aa1897b19857f00507a1bf9e1bdc00d263f526b7a651. 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/QZWFF2496163.