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 0x85b079e686e3616e4cbda46d58c0e70ea2fe813f844024075394fbe472430ac1. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bcd22041-275d-4f9d-9315-7ed1e7164b5d.json and https://artists.proofprofile.net/proofs/artist/bcd22041-275d-4f9d-9315-7ed1e7164b5d.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 0xc486c6fa0c2c42c5a13d9bbf7afeb435713ac5c6dbe2079362943bbb9fdd9f90. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTAY2314995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe59c2ec3e0ef1f7baf5d6587cca86547e8853ebb348cb990a81aa33ef574cd. 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/QZTAY2314999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1baf4a4344ef78eb71b706d816b3dcb4409d7dde06ca565be917507b96d15081. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZTAY2314990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dac82ad4e5530bb88b0ee40b7dedd2c141a4e466f899d4293b24842e377b637. 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/QZTAY2314991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6deddd24555e5778f4b9bfbc54b0a928a3c1e582238268c37b798651f270ea45. 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/QZES82408629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe801010a53b8869d45b55546175b71695590ce2f674db40bba585d9500fcabd2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZES82408636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f6f671f17b60a30e70eddd8a4aaa1ace2a527eda23c0582c60fe75d3b053a6. 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/QZES82408643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdbb7e1c1016c29276c9b928902d25e5510e216c43f084f403b55aa94c24f75. 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/QZES82408645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65832a4684a30456186bc0190ad099779391bd0636d6783d11437aa844a20b6a. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZES82408647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60afe9c385a1e79c05df927d88f63f9d5e18011ee9139f36944ad5067c6b48c. 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/QZES82408649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfebe39bb7fa4345793a48a47e65f4d9705d4341b8c2e6fe44d4bd4c9571b9c88. 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/QZES82408652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2231375c4ae690f1d5e0033ed4faba8647949d893e30af7db5521c93757bfb. 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/QZTAX2380767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8556a205b8f42ec7f6b4b29f1fa53d333e05a252bbc395c93764819a4cd0423e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTAX2380854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc59c1a4ea9e1ab7025bf040c8e6fa2e410ed0e334efc1e0d1a5fd8d7a0b13f. 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/QZTAX2380859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493e13409a67b33b7808c5fc4daa032f6caa4d8ef51c202faf7e81ea3e52321c. 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/QZTAX2380863.