Grade 2 may refer to: Second grade, the second year of primary education Grade 2 (band), an English punk band Grade 2, in horse racing, a category of group races Grade II and Grade II*, in the Unite
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 0x9f74e3de74ce6369b859bbcccad16117080aadf195839616f47011c66baf29ca. 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/235a2714-93d6-4778-b823-ff362de7aef6.json and https://artists.proofprofile.net/proofs/artist/235a2714-93d6-4778-b823-ff362de7aef6.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 0x882e1e9384a5a63483db812993c5b6db49839033e8ef356b65d132814db10a85. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCADU1833341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a10ee667a4a26e61534890e601ea20f2f263d29f141c4c955874885fd18c3c6. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/TCADU1833346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe972ac60995ba188bbea2663fbc17f830af4c5cac9dceb2c58cddc0b24a3e1d5. 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/TCADU1833348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f526d2af5fd2f91ad58024e6023973117a1c0279e84213742e070e76c04e1ca. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/TCADU1833349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5607147077b7e8adecc3648a3fe7f0b95a9cb5576872779eedb5ba8a17f1e4a. 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/TCADU1833366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10bb8a3eba02e641eedb19ce0cfb142586b72b7b38cb8dda442b66691792164. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCADU1877320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea3ffbe403457274861baa24938ae5b2d0c6f26a479b5ac06eb5dd1e43bbcae. 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/TCADU1873522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea1218089d23b57af50bf8d032c906bc14c9c123de127b0c63cc1b49fe67a33. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/UKKC61700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a56b0855514fa4cc4480e69b616f0423aa03b5652574d767091f5b8527b410d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/UKKC61700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8875e605700db19e8e70b8615587db1139c1dc0d726a770bed28ae26f79aac6. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/UKKC61700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe34e54618f0c22e93c009d3f6874cd1ea02f3e248476d4aabb34d597812bb0. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/UKKC61700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc66693e5e85f3db4d3336dd858566d28d94f3e522ffb1e7159ecee66b9dcc5. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USHEL1902002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9e67f0e4464d512dd32f76a25e52144ed6421dca053319646cce5d3de2aa5b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USHEL1902005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee55b468b4e18332a0f4c5d88d6e0fb8388cc2b36e13df0c58da6795764b49e. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/USHEL1902006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a6befab444f3d025166e155d74001ae7705d62db9efa7404d69f9ce2727ade. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USHEL1902007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86cdab87c9d560f0471a0bb2936782a944b2d4f09d5ae6affc86eda2e841fbfc. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USHEL1902009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfbff4d435d4e929bfe689c6797f67fa52d1173f1e4152ee984fc98cb170610. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USHEL2202004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041d7dc3a257dfa59282f03c643b31672f9dfc1299bbd214810c73678670c281. Chain 2 (Bitcoin): anchored in block 957688 (2026-07-12T09:52:21Z), 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/USHEL2202005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9143c148115a6416ad42f913ae74216eab0279e67e9a43e5753210a6320ca6c4. 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/USHEL2202007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a7fa352cd3989569490382be03dac1f25521e52de6ce8fc0358dffc4d063e2. 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/USHEL2202008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb116142a39cebf513d740b95ec013016161d7b21746abf0e47dcd72f2ca8f2e1. 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/USHEL2202009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5957c96db0e6896828c0e830f12b382ac51ada5f0d6d5079ede251e213fb6c. 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/USHEL2202010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1983a181c0ba1f268538e06ab2a2194af94e1681d3fc2db96133a95b072e5d5f. 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/USHEL2202011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572fda3424aea6654351d3a2073be58daffdd464be571a296c73c6809c00002e. 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/USHEL2202012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa76f7bdb82f8a9b7bf57788cd0aabe05d41eb10fd63504d6689fb4b3eeae5b. 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/USHEL2202013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29885b6ca13f89073f272148193e54dd16b2d53af683774e6673e73f5221aa92. 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/USHEL2202014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b433158cdce9c39310c473b0fd61e7ad7a032560612c3014227edc5da8fb81d. 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/USHEL2202015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf316a90a8e630bc4d57caa8807afb89dce6a9786c54d343e4984795047a02ea. 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/USHEL2303001.