Year 1111 (MCXI) was a common year starting on Sunday of the Julian calendar. Events By place Levant September 13–29 – Battle of Shaizar: Sultan Muhammad I Tapar appoints Mawdud ibn Altuntash,
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 0x03960f5c6bf3867dffb3af1243e0c57e8bff71f5d7c0276db5052ab7ecdf02ed. 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/a4cee0c4-a154-4c0a-83f2-b9131451d495.json and https://artists.proofprofile.net/proofs/artist/a4cee0c4-a154-4c0a-83f2-b9131451d495.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 0x011054dd10f7622d347939303818ef4cd9fa3524d168677b16e478a61430d90a. 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/QZTB92339513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d14207e15a80abab0ba8e22a702d58a03536aac09562603c7e992fc3bea7522. 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/QZTB92339515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6f42a2ea97be71a91a6193c455de83740f9040d76a819f4fbd6c5f4f8bf9ab. 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/QZTB92339516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5950e256676be71e8cd9a82a14ba1d73ab62b013d4711a5f0375bbe3e6eca6. 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/QZTB92339517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70e4fdc4f70ee83b3dd8ddb22744cd8f969af8ba6e24b6e8c36e3c7869cba03. 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/QZTB92339518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4472dc2b4ffc1500cafc605fa61ac8d7610e9c417fe87b7fa11e120f7271fb4e. 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/QZTB92339519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f826fc12c8071985af4259b6ea459834d39761b2ec789c4c49dfa03537adc3. 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/QZTB92339522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3bb4ed0e8bd844efe0ecfbcdb9fe368268fc5fb0cdf393265a4e538c61ef77. 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/QZTB92339523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b6bd0e4f536e93689f3cd3b36bc73d58be3d15e45d6d6b3307f273f8cf7d5d. 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/QZTB92339524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4516722affc4d915847128bf9fb95a2e657756feae6fdd4077aff8d4cdd87c82. 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/QZRP52254916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3377df1ebe2edbcbbf89d27d6e82197dce461d841ebbb72fe22d493a8daf46. 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/QZRP52254917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c44bf917d753b96d1be73175692c62a537721b3ab23c0f4a82edcf1d6c6745. 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/QZRP52254918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fcbca7ef26046e61cbfe6da8a75d82faa86f706287a26d4566f2719e79f8362. 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/QZRP52254919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575bd931562389c54b04cb984dac65c527831713fbdf8d2a15cab21564d805f6. 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/QZRP52254920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1790d119b3a9ef30e6c5fd27c337afd8b8b63e81cbcf4ada21ac7f48d904548. 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/QZRP52254921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975db1503afd2537eb246f050a4703718b47ec5d3c07fbaa004a44ed944ebbee. 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/QZHNA2448785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e36f733a2c8b60ac89970446540d8d0b14e87fa731fb0abbf79556c3db7b287. 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/QZK6J2217923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7073e3a3b08d549f86474e1da59f85355de1b9b1df10229d5adea27257a1c6d6. 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/BK4DA2447163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07b97e7b4a007a41f6170f3d45ab2ebb2202eb833717c680e9b7dbfd4ebdd34. 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/BK4DA2511205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e8192f2ed62386f2cb47690e99e4085658f6b233a11ea0eb7dc678c4c60af3. 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/BK4DA2509582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398d855446c3c18542ff4b962aab68d55e0ccfaeeb47c89f54bdddfcadc22438. 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/BK4DA2511206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb358d008d63623356fccbac73b123f467556314bf8708ac8c76275ac325fdd. 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/BK4DA2503620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c21606b77aa6b9aa0b0288d66d2b0374462c20f63a7a7ca52be0f7333313351. 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/BK4DA2511207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6be8a8f26748193ebd90460cee23617f13a56dfb7a5f137417f884ca66dbcc. 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/BK4DA2511208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59da09935499b50acb8bc35491845a7868191cfe14ee0cffdc69d88e4f7a5ac3. 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/BK4DA2502888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61bd480fc6a8cd6d1510eda92873020e97e4aeac09425c587b880a6cd5ed94a. 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/BK4DA2511209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985114430d259fb68bdee6a9ce13af938b15d4459f7aff3003195f95f1de9e56. 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/BK4DA2511210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f864c4387b423a88dca0b1a2d2a1e2e4f679a9a8a075e9cd518d8565693983a. 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/BK4DA2455053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e7f45ea3862ee882d7e4e80c0a74fd416f3c706fafeb6bc0ef2cf29aaabb6d. 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/QZK6F2598736.