alt=A person holding and looking through a camera sits on the stone steps of a door, pointing the camera towards the upper right|thumb|An amateur photographer using a handheld camera A photographer is
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 0x90e5c6c6166ef8f4b62ec02c8629cd095076363441ab28117f607a1ae667e9c5. 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/f595fe43-6470-4add-bb73-116c650413fa.json and https://artists.proofprofile.net/proofs/artist/f595fe43-6470-4add-bb73-116c650413fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Monster Tunes Amsterdam 2013 (Mixed by Photographer & Edu)
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 0xb9707de220b466e47ff0cfeb8564a4c2c10b4add556fb5486bc778f6581475ea. 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/NLD682303207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d3502ed6c8a1b267a95e31f641dae404c1aa8ee8663aa2dae86c3fd85f3f24. 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/GB3W42300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf053c3ef153041f07f095faeeeebe54c2b42f42dc8851d0b293b45a13512476a. 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/NLD681901091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a8309afe6f68d857cc044288ca2aa72e04b261052306111933df06dbe49270. 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/NLD681901192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ed53a9b70a53239ab5b273708a143ff937c6f07ad3aba4cd8d2a061b2a6b23. 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/NLA5K1500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b26108d03ee88ae71da90f31ed0de440aabe68e1a14738ed5c4bc9f2417ad85. 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/NLF711404207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5f7b3d6e4ca14c9401fff035725dc1836bc49d915d86e5beb66eaf25073a1e. 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/NLF711400232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72fa2028b78ce3126d7205db95b7e37adc7dc00c41e390cc6c796d5dd5375d0. 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/GB3W41200503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b521ba198ff4d46b007126f14230560423ea2319e4873dabd54083c30aa35a. 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/GB3W41200504.
Armin van Buuren live at Tomorrowland 2023 (Freedom Stage) [Highlights]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4dd1dd18edbdd9aea8fb130cce27248596c4cf68fde2b9652db493ec8b8860. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLF712306276.