thumb|The Mediterranean Sea, an enclosed sea flowing into the Atlantic Ocean A sea is a large body of salt water. There are particular seas and the sea. The sea commonly refers to the ocean, the inter
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 0x6320c77d4cdef1492a0662c0ed975eb431443bf61d6490dff8c93e15143637f5. 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/a02f616e-10bd-43a6-9d46-527e4c9fa26d.json and https://artists.proofprofile.net/proofs/artist/a02f616e-10bd-43a6-9d46-527e4c9fa26d.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 0x58cf4aa5a41936250f32cdb3e5101da51a4af04266eebdfab14ef0d55368ae60. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZHNC1945705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3ed14dcac14df3bd9a891db1922c40b3d07cd666aee406c1fdd6b5ecadff28. 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/QZFYX2009844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22557cf6cf1da643e5f18bd49af90965595ff4d639067ad8c8c086524d1c394. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZDA52082007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42887581d37aaaa88e3cacebb86b5cc9e7a87ed2a28e881a6b7c61a7b9779868. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR9W12009233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc84b764070d88aaaab8f997479900b75e23677187c77fd693bae83af442baf0. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZHN52062942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8824677a4b075051498ae4818988bd8f95610fbceb7cdf2e83e99badf16de33c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFZ52115708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b9d8ff599d2e29bdb6ba986e791433faa658ec8c1b36dc8e68e37998e64fb9. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHNA2165224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14becc0c41df05816779e041c3c6b2efdd2c6f77bc1157b45d9b89785944805. 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/QZHNC2111452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0142e29f867848a77615baf76fe4b6bd4600f3a2f6bb3cfcc295792721e8e98e. 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/QM3DF2134440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5652261e36470b226e8c509c64a0880d3fe2677e7b0d173dc5434df155686801. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QM3DF2134441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220b1dec83e0c5c5a48ee823280b588b2786b94e0975cc29fc20815b0123c9f4. 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/QM3DF2134442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d3fb07b686f41500cb25634de7afdb4c151ea24a7f5a791db9f5746edffbe6. 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/QZPLR2187440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cd0c378bc38b81ef67ef6b81ebf5b4d61b39868b12a9d326e70097ac953e68. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/GBWUL2211669.