thumb|right|Tan in 2011 Tan Dun (, ; born 18 August 1957) is a Chinese-born American composer and conductor. A leading figure of contemporary classical music, he draws from a variety of Western and C
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 0x5f839cac11284835327ed09a4fd895cd30c81a4ad57cb6d5cbeef2c2ab5cf83e. 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/8f8d3018-a168-4e19-bd19-8bffda3cfa1f.json and https://artists.proofprofile.net/proofs/artist/8f8d3018-a168-4e19-bd19-8bffda3cfa1f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hero - Music from the Original Soundtrack
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 0x7440b90dc2e5d0f983278c491efac60c4cb38eba795ae411dbe876f45e378c05. 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/USSM10212802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9b022cf159db73b4243d76d95c53d99ae34903ccb745d772fa9fd8bdeadfbf. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEN962300311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fda98813e99d59e9a38e9d7dd97041f40ca1897d0e3744045322bc9849730e4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEN962300312.
Double Concerto for Violin, Piano, and String Orchestra with Percussion: III. Misterioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672d296ebcee120d3922bfd5ab360634afedae550d307356ec844119d6623f87. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEN962300323.
Lament for Solo Violin and String Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083911557647adc54fefb6bc3c8d068bfa7ece41040b0577b37401f4dffd9ec5. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEN962300330.
Double Concerto for Violin, Piano, and String Orchestra with Percussion: I. Misterioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa33e661533bdb270cb4a2b66609a7bbf14f988c04f0a38b1032301053c9511. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/DEN962300321.
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
Double Concerto for Violin, Piano, and String Orchestra with Percussion: II. Misterioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538dce4a0e07e8b8cee2ecd664ff05942c6bd190dcc37969b9e736db88935713. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEN962300322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb416b3d71ac5ddf6188cedf169e7f0f420e0c99ccbba2a9ef51bd57412cecfac. 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/USSM10009777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5498fcb4907548c66f7c661e3bbf29b48c45e1fcf31db8bef8b421f8ff02df3f. 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/USSM10009778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22be121f7edb08a9bd70bcf086e561485e5c8a49b8769257b2452dc8eb0127f5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSM10009779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf0131e7803481d182fda60bcbd024fa0c32ec628cffaf3ae00d6bc7712b765. 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/USSM10009780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8ae7aaa047467612a1b447fc0256c7d09e336c8deb4bdf3389fbc5f8031416. 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/USSM10009781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41200d5473fe5c587ab8f717330e1c9b9ca056522d9fabc80cdd0c0d3f5ea20. 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/USSM10009782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee865a83e783c8731af54602f2f3b9f6b839947f69c8a775b08d048f623679f5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSM10009783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863e0c379466f47d926bb067f8891f6924dd3d0fe3c8fa7fe89334210dad7666. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USSM10009784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453d8c3bbb2998df69f059fd3aef721a4ee2a45bfb42052cd209ac7ff1b22e45. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USSM10009785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68388cc4959c98a38dd88acadaf8c63f3a306055dd9e0a1a42dd38a47f7329d7. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USSM10009786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59e685a7c3f2f50d6c0bcd2e44ca7a2cc720c140713b87ac6fc956184f25b86. 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/USSM10009787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c8d58e9b3a6fbdde52226f97aa902d9a0a20cf2da1b92fa674ee26800c0dbf. 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/USSM10009789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b761cfc8d685ece75b5c10b55cb0aa47534430f9463581cb7f2fee698cd133. 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/USSM10009790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530f2c8ca22dfea6bfb1b45b13e265fdc8ecfb78e5ac4327d285904cce4b509b. 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/USSM10009776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187aa173329392c1f0032928af582424cc86fb6989ed278c956b1ccf31e2184b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:44:20Z), 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/USSM10009788.