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 0xd763a15036e1c8df4a48c70615c7d4636b168e5decd61a9eb6ef8a63a567a204. 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/8745c78d-3cb7-4e1d-b29c-26f988b9bc40.json and https://artists.proofprofile.net/proofs/artist/8745c78d-3cb7-4e1d-b29c-26f988b9bc40.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 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 0xc0628a641d6cb2330371b42541d5714e66d480b02d2cf5ad2babdcfdef639103. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T05:47:12Z), 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/CZF141202001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f7c3872c9b321d7e3fe9d24e59a0a522765f524cf85bb6045e47480ced20d3. 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/CZF141202002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9704ecee25ce8b2a404a57e603b220c837c446b257bcf4075197557ac3e347. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CZF141202004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dae9cb062ca48d700cb147058993a8f1e0274a75be4f05d67083618f1ca8638. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CZF141202005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f505043578a2bfd891a7421b033443a1fcd78f482b64971a4a23430dd94ac1b. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CZF141202009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25ed71a3b43a20064913c7370a811cffbbeb438589333a23f0bdbd4f39877b7. 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/CZF141202010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7098e97190288fddf117ba3203ead2867ae1ac59b862f71759b255ada18efea7. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CZJ661300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73739fbecb38d90103b2d95f4b0edef46bc5378eea8d54a693f7d73fdbbe9cb9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZJ661300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957f6d6d08eb1bc4cab5d33b8e7e895dd93f36d70d8ef2df16a2c4d137029bde. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CZJ661300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59fc4517b6e60d8261a1ec1c769725803bfd715b0955c0b481d2ee1df37611f7. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/CZJ661300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb155d449313a5298174d9d8a454f04dbf63d2f17b4860ab69130307619cc1892. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CZA231500272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadae8fa07d4ae75c70dffc772b0e41d180fc6a254969a15656aaf7abf5610bc4. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CZA231500277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0e2d5cd5676ab4d151539f9856244465aeb135a001ff1a745a5e753e95ccd9. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T21:00:44Z), 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/CZA231500279.
Posledni akcni hrdina (feat. Ondrej Brzobohaty)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301c4716d119a313ef04fae2cf382041ac26e78dabcec1748a448c0b5018cb50. 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/CZA231500280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13299587a34ee956bbcdb0f6d1be3a65331582d1e3577bc80299f01b99b8c722. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CZA231500281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11a570b0f6f91d101e07d5476954ee0a9e04394257e3c1e81523612e2599316. 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/CZA231600265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae211c158ab90786409d184ddcbeb4733793f6f66251197d06841b3a6629361. 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/CZA231600266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f19043730935f6aa52e1e633ef7231a4c6151ee3c684bcb10ddaf74c3ac611. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/CZA231900529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e82a650e583d3c5ef52babeb5c698c440f0b142d55f268e7245a344d9e09a7. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:31:10Z), 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/CZA231900530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57705463cf5fd7eac5e371877c0a4787a6d39b61887c9cb15852ae24704295a0. 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/CZA231900531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80991a0817c12be0ee20662654393aa5efeab1bb7024e5734b78a1509bc051f. 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/CZA231900532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4489642a4f8146136cb4e60d658f8584b317ce31a927fdae3b7c27e0f60c97. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CZA231900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae19fd021109ca0539963785b4f2e33b6644054c99c1adfde496a1702204f416. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CZA231900534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97ac145f18a248ffab6ffdf55f1dd7ccc7ca20f0ef41443e9bf726a8db8c226. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZA231900342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39bc839ba9bb286ede4a3ecea7230dc6efb4bb75773e18d75214bca09f1913b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CZA232000477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523c42c4b3e296f5ec63e381ae138857573d3152067b11a6828404bdf1e6894b. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:44:37Z), 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/CZJ662010005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ae17505d6f3f38bcc591545bc6a49d14599ced5a337b02d04881072fa4244d. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/CZJ662010001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4cfe6d7d040ec0763425be28f0819f785de769fe9b6adabceff2fc59030ef0. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/CZJ662010002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6338fd5e1832b9a387fafe7af1fe0610775660052e36703f9cf2fcfa0ea1474c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CZA232301195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79b9e584beb3c95511a4ebe8709354689b4b24f0f688c701973edcf7f2f93db. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZA232301196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c399890882036d811dd7a39d327b46298fe2a9e764d248d678b81196d57e1f. 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/CZA232301200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1228bcf4685a82226c2ce1dbaa0c1aa0d2465f51f8eaf008c32511198ad516af. 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/CZA232301202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0140fc3ddf80c239d66360f0a56e152f84e5f7b5a022de43fba0efc53d1b5a57. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN62594276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb776cb29a64a867ac65d1d444ef2423374b150bc81bc46373ae7ce5acad48f99. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZK6P2577567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4911b4cdd7fc10b3c6850c0b490874007a0c26a61bd6e771b296d269f6b777e3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6M2597661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a79b1b96fe23bd00a33f5e46c70337cc079e39c7bb2c80b5c23a1d983d24d2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEQ2583172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8bed6bbc13f63bbf84b7a197b249b52cfe2d99b1f8cd0cd4ec84368d455c88. 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/QZZ782535070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b8dc1452e44a861d082f3d60671d1c026a28c1f62a18fa1b9dc35fae418d28. 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/CZH442400136.