thumb|right|Young male catkins of Corylus avellana Hazels are plants of the genus Corylus of deciduous trees and large shrubs native to the temperate Northern Hemisphere. The genus is usually placed
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 0x6295106ef424fa0dd3c2b5145214716c5cceb7f04136032d670d560c69c065bf. 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/ca0a6d48-5da8-4b77-992f-05ef4c5f9408.json and https://artists.proofprofile.net/proofs/artist/ca0a6d48-5da8-4b77-992f-05ef4c5f9408.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 0x9b8514e4c4f4d3455c9bd81a1d1253ba0e6d8a7549bca126334d84f961445fc5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR96X2001384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08220363e8970d203ddacbc7070f2d97da006f796923df2813619b561da9084. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/FR96X2001388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c505d64ad3255b270acb275a3ac6501d5c168099b73e422b8548e089c27499. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR96X2001390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c960f514220f39afbe07c84261473c1163510f6b60875eafc4ce26116413bb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/FR96X2001391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1064f257d940257068596b35e3216b1c4f3a494340fd09304e668e444d1f568. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FR96X2001392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5efcff4f4ca1a41c380192e182ac71fd72562e3fef86bccc181fedce65344f7. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/FR59R1491293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd955eeba8c207677501af2e1306b7d5798df4ffcaa1aaa768146a902dede0b. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/FR59R1491281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33237a8c33dea4adb73fa9c10773e700bb1ada8cbea4545e0c1347a998c8548a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR59R1491282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf9d1e8fa320489b82717339d4512a78ab86f1a54556328d5493702b8983c8a. Chain 2 (Bitcoin): anchored in block 957658 (2026-07-12T05:03:28Z), 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/FR59R1491283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c31fab4eb459c029fb93c360c6f3263200d50808203bdbc2c8fbc4dceee9afb. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:57:02Z), 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/FR59R1491284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963d16c3021ba0cf8d0847089a6afcc744bf34e03e70d3bccaf607828539dab2. 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/FR59R1491285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88c7eacccc7fcf72cd61ec9775210261ac29c5bb3c6d7a5034598053ff72abe. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FR59R1491286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894b6a3ec651cd961f5c1d85c15d45e4471a4fa88a13627a4f2202f2c53403ff. 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/FR59R1491287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4b1c470418eee7b42c453eef502d0fd175622129b0fcb2920cf2a83e7fd213. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FR59R1491288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64ad9df7b2cd0c0bba0ae23e724917f4eaa2d75881fac352b0318766cd32454. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FRX201522364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba812832ab0cbc8458d9aa9ecbc3783253bdb5c0620f9c8badced552f511bfc0. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:50:37Z), 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/FRX201522365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3903d1b39028a0d47f3de1d91e8d7e361bd04acbddf6e747d41440984a529727. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T05:36:07Z), 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/FRX201522366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4a3b68ab1b9eb0ad885bf52d0cad88b3b461f3bf70e1579526d86d6522918d. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/FRX201522367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2113af78ab69ab0b193ea0ffa162ebc05a92ab5c9c5839885e50f17e583860. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FRX201522369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5188e059c41aa5d394919dd732b1b0cbb30d3a4cee7ef392e4e9ae53de0bad4b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FRX201522371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1170d6b2a5fe0fb7879b9a45387e948c310c68106028951507b31a4f434fdb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/FRX201522373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec4b7a325333557d1366339fa3001c91adc095d1fffe52c5271f0ee0d1802f8. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:36:54Z), 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/FRX201522374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0aa43764ad4335085250daa7fc08e90464a810425d381ceaf1de896002e5bc9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FRX201522376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77312a022bbee05d0fb118e3e1b82a374eafd370f3408796a486a254c96bb44d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:47:11Z), 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/SE5752129100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc80af2e700c109a011624aef666f6c27d477c3bf138f1112817f06fa641247. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:02:42Z), 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/SE5752129104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0b1fd826b59881091710fa17e493912c08abf6d5cf7e9e4b9013d4b15db73c. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/SE5752129112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ed0822c11d898a779d0142360e57e67993edfb82cbad4bab17fa464a90331d. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/SE6A92154605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb127137e4efcbc6d761679f31488dd7142442f322a54af3d2db0e19f0b78a814. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/FRX202182090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fabc7110cca01b3b8027a817b98b20a297314b767a968841530e9788e3cf34b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:08:24Z), 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/FRX202182091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76020cdd49c8c369d9d9cca7a224d3f20dfbd3567f0e64ab423746fb89534a77. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/FRX202182094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b102e9ed4a2af76c5ae91b9b27bfc45ea990e2c83d1263bbe118f7e56ed02c2. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/FRX202182096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb089027ab35087d7c918bc3383e16ef458d800aa18da45b87c3f5aa1858be596. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/FRX202182098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205ba12334142f0535dce87e4e1043bea2afa2f5375f9118c00b4ea507c66784. 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/FRX202182099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff246d77ebc194d3ece8e9ac7bf61a3fac1b982dad086525db44c92170882f3b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:40:42Z), 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/FRX282110325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27fe03589f1cf329e73aa977717cc21a46fcc5cf9dc287754c45ae316f35ea7e. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FRX282110326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef23f2e356bea6bd5a15f94ffbcc33bff93d53fa55e32389e05d7d38b841ac1. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FRX282110327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c929a85f127c7020bf3dad08cb083d4e4b2ec592812951082d0ae57ac2f248. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/FRX282110328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c20bdc0797d2ff3b3e3c4a74ae4f0671a390c7b0891d502e58d66dee3c3aad. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/FRX282110332.