thumb|The Tomb of I'timād-ud-Daulah in Agra, India A tomb (from tumbos, meaning "mound" or "burial monument") is a repository for the remains of the dead. It may be above or below ground and can var
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 0x0121ecadaef16661b65de32007fc55041af8c113a61101c7e65c6b679237be6e. 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/ca59cc3a-6a7a-4ecc-b98e-07bd3296db8a.json and https://artists.proofprofile.net/proofs/artist/ca59cc3a-6a7a-4ecc-b98e-07bd3296db8a.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 0x2c46a6f8dbacc96d6b4a9f1b032741784016e1ae9f99713331ceae56a0527345. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/NLD682104113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627c37c3bf249783e06c67fe43d0d8178e8a2ee79172e7982b0b13a201bc9c56. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CA6D22300043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc1d667a82ce66c38de32391c62de073d5b44663031d2c6844bde389fa3a60c. 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/CA6D22300176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebdf106b3ee563571e118b63c24691aeb5acb59fcd77ff027ebb2a8a5f35ab1c. 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/USA2P2329369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07414ad638251cd6c37478b98e8f070b83d7c6589ccb08768f0c338a843fba9. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/USA2P2334793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75eb3699686c9264de75bd3a809bccfca912caf5b09212f70d5f9c82028b5b71. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/CA6D22300430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19ad05bc2807e2a2332321f313e41348e23b219052a2ff3d86fbd847a525ed2. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/CA6D22300431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb295a4e32484659221536cca954a644df69824b3aaf13d29816857149f3770. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBKQU2484257.
From Within - Re:Locate & Simon Anthony present RLSA Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa6db02936b5aa3214c276fc503bf0d84261279f57c9cb49dccc5113efae931. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/NLHR22401242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda973930126f452ae55806189cbccd98d2b333471043b8499bb6186998d50c8f. 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/GBKQU2504902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd4a1864c8c6e5d5367d820cf57113cff12344a1f736b5348cb6b035bfb5968. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US83Z2237683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaf7696925a68934c68881287aaff7d2e6410f5c06855f662b8dc55887ab811. 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/US83Z2237684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b8dae301cea6112a1a84bd8f45687e9f8d3359efc9ee6aa0dd6a9dc55b2c29. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBLV62418938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00bdf36565d4f8db6a821327ffd6afdb965e8ed1c747f3a565bd0ba6c11a9571. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/GBKQU2508489.