Div or DIV may refer to: Science and technology Division (mathematics), the mathematical operation that is the inverse of multiplication Div(X), the group of Weil divisors on an integral locally No
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 0xdb0b3e1c4fbb740f8b08f82517f461572f86a397bf1b0aded675b8bf2d5ff2b1. 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/6bb8a45c-ba29-4c9e-b5cb-6770883e4ae3.json and https://artists.proofprofile.net/proofs/artist/6bb8a45c-ba29-4c9e-b5cb-6770883e4ae3.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 0x8cbbeda5a4c48b98eeeb99ae5c0557060ccab5f48177a77ed8aa975f0a3346b2. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/JPF301200121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b055f7c40896680c3589018022258ea26b839f6572cc67670ea65ffc44755c. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/JPF301300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb795a11f6eb33719ace4b47643aec7a6a06e6d4c8bcf9079d972e2c47acb0504. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/JPF301300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8a15c17adce757bdf2c0b45baaa643bbdf5254e7d322e9dc048f76e6aaadd2. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/JPF301300081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889a353c8a4269da1af735056f3b2d267931dcae7e4f7a8ea7a37320f1146a25. 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/JPF301300082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727aa077a20f92d20a19f936d7f16a37c62f7bfef514201ccbd9e622f258aef8. 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/JPF301300083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c597cf8b952c2bf93f66b300b3c6afa38499ffa2bbba5d7c9e383d44f306660. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/JPF301300127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa954952f7696c9f092eb4e90430e1e0cb1e36905c8241d706f150342c72b3acf. 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/JPF301400154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5919dbe6f3ca4412b1696ea62483255f2644655a82d6c5aaf817c5d68d95d2b. 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/JPF301300144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8278ed487b4b3f981cf181b3ecd65d500fe72a3b978b82bf7f22826e6349c46. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/JPF301300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4611445512c93eaedd8bda5ce721be6a66b4e3cfce28563ddbaccc45311ada41. 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/JPF301300146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31476d6fee492d54ea28f6cc98b42406c3397c8949e7b41a029c9c92466da344. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/JPF301300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa235bd1d51792c614eb8c9e952d19d7c9068cc6ee17ba7712da548f53f6e9a07. 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/JPF301400051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4980414dcf7ed1bf8f30d7001d23917f384591566a5f05f702d5b1d1faa804a1. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/JPF301500097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58792d1e8685f50b374b2ac9214427a11fc38adcb869fdd74857f39952f5f88f. 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/JPF302400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96b5096337ce0b9ac26c51b227c75937b0ea22b164fe794ca1f0c93d212ec0b. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/JPF302400138.