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 0x8c4d8865796aeb77c4652b85bf3728c029eae35296fe7a2314fc9fb9453a08b9. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75ecc458-5560-4e02-9e4c-2a4f7e657c0f.json and https://artists.proofprofile.net/proofs/artist/75ecc458-5560-4e02-9e4c-2a4f7e657c0f.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 0x7b99220d4a845edd58671a520301b4950e173dba77b95fb0abda1c9e03098ab7. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/LVL152003518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4637c99803f3432cbfcd93d2c6a6e793cb6206af608c5a13b6701fcd2f0d5552. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/LVL152003507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084c6e2ab807db31076629e9f5126355e4953b5dacaa4d112c11b58c8de3691c. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/LVL152402639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fadfc8f0f8263a7779a31721361a6de7fe883c0dfed36a3444ca4a82554fae. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/LVL152402213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaaf29b0fdabc7e6ebe6cd03396cd9cad6e7526b0ee0f01e8e20631b0ca20033. 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/LVL152402020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9450e91a1d52ef9de6957f22dda501cf6782be9a40433c9955697af35c7fb84. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/LVL152402021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5c52e7c8b87b760853f81d08f652603bc636e3ed9ed17166de12e830b4eb65. 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/LVL152402022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa8ddcea42db2c52793e8cbbffa92e823b84d59c4d34b2a089db6b25c9eb8c9. 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/LVL152402023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07530926d8d92749085f4a7f2cbc6cb8950fbb9e04f1b31dad74b33a5492ad03. 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/LVL152402024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e0c22893086d9c34f4fbd7b6cc08e458c1ad448833c56aefc8ff511fa5c8cc. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/LVL152302189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7824980d3476dd396e541f6c2482183241ae08e28c4cbead1e706572e7a01490. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/LVL152402025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11937bf01e173f3c384310810d4eceff5750d268bae67a882aef31f3f8f1f12. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/LVL152402026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88edec16fa60789920ab65e5c358c9d25c892c4a6964fbac2161e8b2d1ced5a. 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/LVL152402027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8ff55a5633bcb75c11938d662a8c0a30c682ccc93ad1acea41d61cba438f4d. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/LVL152402910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f855aef313a9a2e50559ff5103ffd7c06771ad9a8471d25a922dbe0b68232a. 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/LVL152402029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2be29b76cb0e46aefb9f65ba38bc18321b556713136eb53d4e114b1d0b9348. 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/LVL152302493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3381631503e630ac11d46ac5329a75cc05375663040722da97041e2bbddd1b7b. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/LVL152402911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4a5be026f1b3c28322a16dd9400434a152960550ea8bd0037cd295e9eac995. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/LVL152402030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd762192b064da2ac2bd032b3bdba3cb2f50be9c78925cde0244f7844dbc01f3. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/SE6SA2553559.