thumb|330px|Multiple iwans and tiled domes of the 16th-century Persian-style Mir-i-Arab madrasa, Bukhara, Uzbekistan An iwan (, also ivan or ivān/īvān; ) is a rectangular hall or space, usually vault
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 0xc214258d691717dcdfe132f7a3d67b772d9850ded1ca3848524c0205de50cbbb. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b90e4cc5-678c-478d-a7e9-f438da45703f.json and https://artists.proofprofile.net/proofs/artist/b90e4cc5-678c-478d-a7e9-f438da45703f.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 0x8f0dfb98d7fc69e809083a5e32a0fedabc3662f0d5938813e6bcdaebc2ae5206. 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/MYA119300115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27354e621c555c89886f14c23200f04b31b0a0e2f9aedc15cd370cc4840839f. 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/MYA119300116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabf792e95bd4ae9b5e97d8ac3f5cacccb64b5caffcb840151b8d54b029c9359. 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/MYA119300117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0003aa55b5667451ad23869416ce0d4ad773f8ee234c17501fe86c3c4c12943. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/IDAB30614042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298d2355eb9d48bd8c36cd1ff965a2bc04abed7666871653b9c59a95be4eed69. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/IDAB30614039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71c1cc80264949fbb1023b7df1f302f7592919b229035f545d61748404438e4. 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/IDAB30614048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12b2c555488804a3a6ea4c5682fe7b179ac04ecc49eec40b641d887b18f592a. 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/MYA119600171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd811863f79f471b4297c6512356b1a902ac1f16bf434da90f3939ba4b80bde. 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/MYA110800214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414299c2b251ca2daf5227ec5b23b772a2c77cbf9d70a2af3afbc8d66e0431d7. 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/MYA119300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cf18ce96e8e6ef9aa24662123a1c72a9b9de9767bbcb539d9e97b34e874264. 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/MYA119300112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0dfb98d7fc69e809083a5e32a0fedabc3662f0d5938813e6bcdaebc2ae5206. 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/MYA119300115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7de63675c95d08bd4432e47b20a00b8b4cb1a01b50f38df3db1b08bef0c2fd. 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/MYA119600162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabf792e95bd4ae9b5e97d8ac3f5cacccb64b5caffcb840151b8d54b029c9359. 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/MYA119300117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b722eb1cb34826d8eb651e654efe083a1d1b64ff53e7a154357c613be6176af. 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/MYA119300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f6b10ab4acbd6ae1670a5103f51fe3f1d40edec3e5fc36ac074ad3c00bf3e8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MYA119400151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d965d800bd6a0e0ad667a74700197ae728cc8de7667a16dfdc221ed94549166. 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/MYA119800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1829cd27110eae6d5c7205661b29db0a203b769770f611a0582150ab80780162. 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/MYA119400154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc08a666d55f17826fc165b2ca0e6b96b2dfc1537b813684bebe3924c0aef920. 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/MYA119400155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf959019cc4af308d3f2a5b42b40912cc4d0619fb8afab33dac099383a4191ac. 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/MYA119400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241855dabbf4e7cc4285485e82a1a09683b40ca8c3360e05c4415e1801c08f9b. 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/MYA119400160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ccdc51d6924002fc4aed23b70694f2a14b624b54d99ab41008facddee7b86d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MYA110800220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c8422fd4e9f0e31b5661fb613c576f21cfd54be806e804c03a5e0a3a2a97c5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/MYA119600160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58cce312b7d9eeefcd8bd4fd7c92c959039065e242d09f163d830b91bbeb648. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/MYA110800212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0ccc08677d91df6ca02b96bf31ed2ba248963d5c9323d8286c10a56b54937b. 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/MYA111700598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123b0bff2bf88a9152d7bc0e5db161c98cbddbb1191f7e5f53a63561bbcbddaa. 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/MYA110800219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5944a76dc3fb668b3dad18bfe67070ee79ca78dd184d4522ea6b8d0d0e809bde. 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/MYA110800213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6220ed1c311747ed31095dbafa2dc17b928a39ab5e8a61c0b28bfd2e7c7c7140. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T01:12:19Z), 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/MYA110800215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd862d08cb7656627b38a4fd7d6e29f65a32d8ea780da7f4b5146a675b62ec30b. 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/MYA110800216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe830f3a949dde8d8ea30810cc2f86755f7550ad168b153c5ce9043d805b1ebc6. 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/MYA119600169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c19d3a149efd3e77650df0e1ba9899c36e7729cc8692481402dbdf024bf651e. 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/MYA110800218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb085dc6a3db67c1d68d9739772626e0bfdf52b0a81c3b175a04907852d1de6db. 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/MYA110800221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ac1ef5448dad866466d9fdbb3decb5cd9e8f28846e3c8741780a800ced696a. 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/MYA110800211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6ad976cd84395a8b4291b70bb47c9cdf299b90cd55c548ff96b6cd00fcf300. 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/MYA119600164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd868fcebf3ffaec48e6421edf64b45d40b90dc99e3633e2293c0ee84a739f095. 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/MYA111700599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c8422fd4e9f0e31b5661fb613c576f21cfd54be806e804c03a5e0a3a2a97c5. 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/MYA119600160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793415f68f83e8c641c74b92b2870cad447c972b8250ed26176b4ca6c79900b9. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/MYA119500147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbc512d87e8074d7855a468f67e50c9f8542fc2be061f6c092df199af613271. 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/MYA119500148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd811863f79f471b4297c6512356b1a902ac1f16bf434da90f3939ba4b80bde. Chain 2 (Bitcoin): anchored in block 957034 (2026-07-07T11:52:37Z), 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/MYA110800214.