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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e5c6c6166ef8f4b62ec02c8629cd095076363441ab28117f607a1ae667e9c5. 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/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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ae562e7ccffd3409525ec68f74a03f3132b7d6c845ed064dba72853d283bea. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB3W41300657.
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 0xecb1112858211e934f69382d26c523345514872dec1e14ed97af1cde72278f60. 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/NLD682303208.
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 0x0c508179eadab8621de7589f0de28c91f8935796ba3cc88a11b86b3a9a952e50. 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/GBKQU2041154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b26d4c0a607637281aed11777c170f070eafbadc214218f250aaeec860220e2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLD681903577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf053c3ef153041f07f095faeeeebe54c2b42f42dc8851d0b293b45a13512476a. 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/NLD681901091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a8309afe6f68d857cc044288ca2aa72e04b261052306111933df06dbe49270. 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/NLD681901192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9364a4c407cb0644d33d9e85f95f6112c14c5dbe089ef5af4cc5588dc9389ddf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU1907814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7f09a5bcdb037b1cda638e1883d2ae5853ff6ced98967f8ee71c39b0309977. 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/GB3W41700044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92871e17142d5528f9c74bb10ce6e68899f17c53ae418e37b2aeb1829d07785b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB3W41600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2ddeb96a6d366adb200eeaed3820de84e447c4576c5afc7c54c7b95e36bdb5. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GB3W41600014.
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 0x1395596a7bad15585eb91272e66c8467d5c63b1a2689c31829dfd8d6456be9f2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKQU1587842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92ae1634b1a65cb982c96a3bc5a0134f376550b43435c9cc110f3c595b65a56. 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/GBKQU1537899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51f773ebed505ef5e25c375f6e2a921341a42ea9110bcb8ca364995ceb6d6bf. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBKQU1537898.
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 0xbdc027d4a204ddf23a7ea7d18a84827915fea923604e6a38bd92622bba912b6b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLF711404206.
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 0x04902af15e04b68323c991410c6dff44575571aeada02795704a64c8c55a4a02. 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/NLF711400231.
Who's Afraid Of 138?! - Photographer Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970b3983de965a855c350be23351eff7a11936fe90accee2f92c3da9f6f58d9d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLF711306490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260d438563f26ab88c5a09b823ffc1fe606310c6bf21dddf740fc4c11471ded8. 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/NLF711306491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6536b6a6c4024d38c95378a01d07a6253f093f722c40e7e11bb86587f07d1a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB3W41300080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf20a1b3e93f805775a47e3f2caa607c341e7ddc862997528e0561cb8670d01e. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/GB3W41300079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72fa2028b78ce3126d7205db95b7e37adc7dc00c41e390cc6c796d5dd5375d0. 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/GB3W41200503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b521ba198ff4d46b007126f14230560423ea2319e4873dabd54083c30aa35a. 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/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 956894 (2026-07-06T07:53:57Z), 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/NLF712306276.