2Cellos (stylized 2CΞLLOS) were a Croatian cellist duo,2Cellos biography "Young Croatian and Slovenian cellists Stjepan Hauser, together known as 2Cellos..." consisting of classically trained cellist
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 0x151ca378a57dc8e584e1f9a651b73d3ce2c736556ecfcd0e34d384950d7e2e98. 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/68675393-6f6e-4bf8-b7f1-4718b0af5528.json and https://artists.proofprofile.net/proofs/artist/68675393-6f6e-4bf8-b7f1-4718b0af5528.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 0x6b564c680bd53a18235ea591539818eb551ea66088821812d8f9f2ccd1d61469. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USSM21100810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4131e67a0252558caf981304af2060c24dba9f0d67efc7cf1a99ee8d87d3d9c8. 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/USSM11204851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1891319ca643ca20f74799bff646eed4a2829b6a238627c136d4adf8d2d9ef61. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:35:59Z), 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/USSM11204852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6683125b0eb828f8bdc80c180cb11da7ec5125ca4c60fb06dd225698e1ce92. 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/USSM11204856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8262e1e0912d92f870bd834c0d713a5f4e6ff5bd393099c13a44d150c08b7a. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USSM11204859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525d06f26d10ecb8e43e9d6478c63aca0f9ee75eb3c201c4b2c6df23e73d5190. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USSM11204860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e62cf2eaa071858cab89b7c3160c03440861e726cea1ab7dfe02335e27498e. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USSM11204861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b107bb762b2a048d77c0fcd3993e3e8ba79bcf312d5f406b6edea37015a5c2. 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/USSM11300458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2aa40af62ca5584cef8841baaaad5bc61e9b147ca8235220518c3e2e4531e12. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:48:37Z), 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/USSM11204853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85af551d402a6f0342a6c44fe1dbda1f285a79a0bf2b298d6553c6f51cbee468. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USSM11303952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6683125b0eb828f8bdc80c180cb11da7ec5125ca4c60fb06dd225698e1ce92. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USSM11204856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8262e1e0912d92f870bd834c0d713a5f4e6ff5bd393099c13a44d150c08b7a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:21:56Z), 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/USSM11204859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e62cf2eaa071858cab89b7c3160c03440861e726cea1ab7dfe02335e27498e. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:29:24Z), 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/USSM11204861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48f8106ded97d88f45dfef5cc99c535f09f23ccd7d4366556dac5d35e61722d. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/USSM11407605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285ca4eb557a050b2c4753271ff8da60bbb59f6778c2df41795334538fa7dac3. 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/USSM11401512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc028c61843fec08461db14355c39fd8ef3bc03a71af4e7c9eb181fad597d0702. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USSM11407610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e39051fa4a846a13c528ffa8e5ff62916a13ef998a8e38f81e45614c6078439. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USSM11609373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fc01222ad88e54f272e304d0f29b8d5f6fd88f98a81dc4cccd4226eb54e0f3. 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/USSM11609377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5cb05b8b6d8ae2d60bcfea17660e2a9dbb4035723e27e87fe3665ddc3ccbb7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USSM11609380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae81c191cd5267122d32d4a1759d2c717e0117005ea23a361fdbda995dcef0e. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USSM22101183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5cb05b8b6d8ae2d60bcfea17660e2a9dbb4035723e27e87fe3665ddc3ccbb7. 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/USSM11609380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe51f9a1d0913acab2c4a346ee8770b6c9a18de282be1bb9a50505d48a1fd662. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USSM11609386.
Violoncelle Apaisant (Musique Classique)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee701f45339fecc127bb1e06e3081a9b727167bf25b43547b88cd3266ff01f4. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USSM11609376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40bef1ab8c1374ff7a1a0145f7dc9e6dde6810937768c9b8baf2d9e7f64c710. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USSM11204862.