thumb|upright=1.35|Depiction of 70 AD siege of Jerusalem by Francesco Hayez, 1867 A siege () . is a military blockade of a city, or fortress, with the intent of conquering by attrition, or by well-pr
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 0xf716f24e2a4de6397adbdb013be886abf7d7bb057a9520608b3c1b6c24091808. 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/2eb81777-e9c8-448e-8109-448e7a286837.json and https://artists.proofprofile.net/proofs/artist/2eb81777-e9c8-448e-8109-448e7a286837.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 0xceae13077255da02453b1499150e9c617c1411443b8357ea4137e3a1ca2278d6. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USQY51773819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf2d480bd848d33c651c94d242f40382e902d90628931f7b5bc4cffd33bbb21. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T11:07:44Z), 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/GBJAJ1801951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d9d0796197aabf6983f91da8a6eedd124fef71750f4efc04761bed2d518484. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T10:59:03Z), 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/GBJAJ1900754.
Toolroom Radio EP484 - Presented by Siege
Tomorrowland 2019 - 15 Years (2005 - 2019 DJ Mix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6e767a1fc448e06a9ad8a58a9de80358f079fd833dc9e49880c05278ebbb49. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/GBJAJ1901987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6360cc4f377b4fb7890f2a7f4fe08b06b7ae978b8d96a5882b017a00b37664. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBJAJ1902564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720a364080383fc4e1930013a354c0879f85db8b3fb671fe3de0478c59eb74ef. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/GBJAJ1902873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cda3344550e4d3d4b88dfc6500ea2a28570536735f2cccf741b050282a63af. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBJAJ1902874.
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 0x31feb2eed9ec1014c8bdca61eaea2a64f6317e38a1da0a56daffd82c93d7eb1d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GBJAJ2002085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d2aca1afce9ff46f6bc6ecd60d128d4341cd9081472698856a1b0f4bf77bee. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/GBJAJ2300162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb97fda4e4754251c187270a183bf8d29890cc946f168865517deab6dfb410c. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/GBJAJ2300538.
This Is Toolroom 2020 - Mixed by Martin Ikin (DJ Mix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b41f54f5245b2eb7c5f54f27ada8d2eed3ad11ee7cc6be84147b57c0fd8c6c5. 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/GBJAJ2000136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7082eb3a93c07366cc834283e47b8839e07477625a0cba322f1166eda164a602. 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/GBJAJ2002521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45111c19e99b0317c3c9c78f6ca3be8c7dab8f00d59c0e9ad3edf4d33b8f331. 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/GBJAJ2002522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39389db6afb9acd5aa69a544bae69fb47dc616c57604e1f298e6d2c4c2e5151. 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/NLUW21400204.