MAXXI (, 'national museum of 21st-century arts') is a national museum of contemporary art and architecture in the Flaminio neighborhood of Rome, Italy. The museum is managed by a foundation created by
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 0x28109fe5a1a7760ca9dc066a73c37158fcfc6e941c3f56e3bf5370433cc91673. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4077d14e-4182-4564-b76e-1d10fb2a69d3.json and https://artists.proofprofile.net/proofs/artist/4077d14e-4182-4564-b76e-1d10fb2a69d3.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 0xb454a95b96ca4c34af77c140dc92f3892b112af96051a8a0d27a08f53ac8d06e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T02:25:29Z), 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/GX3Q92401410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7d040b37b98283aa9468bd58e7bc6559590cdb7e7f8dacaac78f2be74e5db1. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:40:11Z), 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/GX3Q92401411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae867026aedde22fd5d785a4b0e58fd3b2f0dc0c0cac98a8ff97b20b4e0d4714. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92401412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18401b00ca4b74291aece853e4346a456e65c86a95aab1800fb9858a995ad7b5. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T02:27:47Z), 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/GX3Q92401413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ea9d1eddd1f1ba2cabd6add30c96cf756f633ea1e0f578f574ccae68538e1c. 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/GX3Q92401414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0976b42da034371ef076db7d185eb1becbdfde7537d3302418eb1d571302e24f. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/GX3Q92401415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae783369239b87756dfa57c7fb8d9e3ee7d75a76e8b53e31498e6de60f2bfb7. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/GX3Q92401417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81173e1de2a7d3a4457ceeb796ba8f7e7592835e167f8eb440eabf9e26e1f74. 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/GX3Q92401418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dacaf2aea37100347ef6d971b20060b4a8b7bbc0fe3a577cba1064ea54cad02. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a07e449897b896e5581759a2b231595c74c836935d5d49881f9a6c5483315a3. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bfbfc91fb8b47c7489423f5f03353a14c82ddcdd59815be4280d0751fa9c2b5. Chain 2 (Bitcoin): anchored in block 957730 (2026-07-12T16:41:26Z), 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/GX3Q92407920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8be625c52e9f410c305999709ac97a8ac935bf7b55df64f3402060d0c418517. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/GX3Q92407921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd539f1472d1ec824343308c6b449c5763701f5e0b1102b8ee595e6d2b04c9917. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/GX3Q92407922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7deece6f61c47a696e295ed512ddb1802b366488c646cc2744e19c2208454ba9. Chain 2 (Bitcoin): anchored in block 957852 (2026-07-13T11:25:45Z), 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/GX3Q92407923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d61f26972af8b2cfc6764fd54b55e0714de354f060d8d1d92eb3cac424e05e. Chain 2 (Bitcoin): anchored in block 957726 (2026-07-12T16:04:28Z), 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/GX3Q92407925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea51dbe82dc29097d63922cd19695da6d092239c07a3c815856981c14a2e78a9. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/GX3Q92407933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc194e161baa4e2c2f420ba5ebb6af2b88116da2a28c109a9a4d05c1b8c9fc7. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/GX3Q92407934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3684acb68cd5283418ed28006b548116b48643b5532ced50a6c6319355277c76. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/GX3Q92407935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6850973298d18755a746d2d47d6ea75f07356069ee1798c345db059398351e07. Chain 2 (Bitcoin): anchored in block 957737 (2026-07-12T18:02:09Z), 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/GX3Q92407936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7986784296e41b6a800270d6069225510f14fcca2d46c3b2baae39b237072f. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/GX3Q92407937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c091ce596ba8e164e8abd3a32c8c450e6db99e58526506b13d089211092387e. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b8e07e58f14f4ceb0a1076183567f93ae341b869de867a3fe2b53bb2a4b25d. 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/GX3Q92407940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf88165581b85dcee08b24e9f5f02ab47a227535eebe1983ce4a892da4b44280. 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/GX3Q92407941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc459f6638e7b42f1b02246fcb7a5abc5318335c09aa84fecff7a26867224294a. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5738a1f23955be779f42a773eb6f8a8f7037e579088bae60e1c66410e33e5d. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb202cef76c6fd33c399221a3db52a315219d6bc5eeb80846979060b22dbee0c2. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/GX3Q92407882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd96470a4c50f989f5160f5fa85f1a26846170e52be2feb587d89d3f59ecb8a. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860489e7f3ced7d05f19fe2465867ddf7f25acab30bf7b26d404d1cd3e4ff774. 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/GX3Q92407884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c1ee05c9445b67672867bc06e3a656c97867b276cf22f4c1ce20c33242dedf. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90c71cf277a2437057bf506deeb6ed60105fd9c1dd8638b1a3214980ead1d07. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952c31438eabfb14e1ef8130fe387b7a72aff5a7ec1519d970765578f097c4ff. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/GX3Q92407956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd4cfd53a0aea5cda95ed39eea9d8911eb8c9cee223b9c63ca4c8e563ac8600. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1b6e4f6168b6921ffb1aaf8f8ae4650379a462ff764d9a16b03b22b1c66c55. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf83095395b37e515ba1a350f1887daeb91983b0c8e7f597e8c0b2a4eba085a7. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c4aedc428a69a9113ff327050a7f183a4aecbb596f7f2e8074879b39f14824. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GX3Q92407960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaecaddffc12108f4ace8cfe922fdd6cb49b5a509423fda1a75728189bacd0fb. Chain 2 (Bitcoin): anchored in block 957730 (2026-07-12T16:41:26Z), 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/GX3Q92407962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f235ece007b286aad6bc001a2366be56154639c3bde2857dc165a5b840a0095. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/GX3Q92407963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2010fd51e21821748efa9caccbff4dd01efb2be221f72d2b31b23633c1e152. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZQAY2514972.