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 0xc28e816db5473098d42046f236a108626eb0509f8403bde36a34eaee3c9b474d. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d62e085d-c0a1-4069-b145-a7221c17005d.json and https://artists.proofprofile.net/proofs/artist/d62e085d-c0a1-4069-b145-a7221c17005d.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 0x24af13bae627f19d56976374045129470d17e98a4c94aea0e7b00beaeace8691. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZTAY2525933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351855900b7fd6ad077b4c64b93ae9eac1e7067606a8e9b9c63aed0f4613e7ac. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTB32579172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab85d199ed4130187cf50b6f56c02545ee2d1ced874c45f3f84739a5fe278903. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB42583303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a8b107a8e02dbafc80142be2675f46cc041278e9d74e5dfc90cb235af7f6ee. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTB62523364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a6a7f66035aed0f85727c2c9daf5001bc9233e28376955c31a0701547a4a90. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTBA2550067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb856665499216961f15e63cd751cdbc0ace076a45998af4ed0efe494f347151. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTBC2569503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854dff5dbe067f911ee4b7f845b5e706f032d5643b5943d0e7d5dc9a553488bc. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTBF2564069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0699a313c5e09093df1ab5b3c5df84bb53593f8e351aa9853b441132e3998418. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZWFK2506962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0696dd2a589c3bc937ea31ba620689abad9a3f7de5d43d31c073bbb856b31778. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZZ7Q2590094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cca591cdfdc49a94b72372990b0beb3640dec49d20faf796b5f20caef869fc7. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZZ7Q2590095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ae54b639d9017d095af63ec31bb047cbe4963e68af540c65dd70003cb6cb9f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ7Q2590096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ceb9300c1077e891b19346e91f07b7abd72ac14763ce33b25b22a7d9dd7ebf8. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7Q2590097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30612117bbb8f09015dac1e9425df90cd926cc6c4e7dddc5f490210b40dd803. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZZ7Q2590098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbae7f30763af288dec635fea8b5eeb77bb718244ae9af6124a88cd84653cbbe. 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/QZZ7Q2590099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db15139a0f58b7a141552d6452d09fa4472ae11d56265b663bef4a012db5fa3. 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/QZZ7Q2590100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f43ab9c9afd75fcd0240125c594c83441a9690c9d46279801805cf2c342237. 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/QZZ7Q2590101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd4d691eafb309394737c375ee1d7b209121062c3e2592f67fc3ad5d47e6f5d. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7Q2590102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749532e738e8bddd9a1330ec4d69239e1d16bb28490f984948ac448def3d56b7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ7Q2590103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8de3bc0e2d0cc609bd3538aa63638753cf14d022bd7b80ad40ead6c34c3b74. 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/QZZ7Q2590104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7308c1a3ac7979154909f24f401ffb8a7a6fe1bf71601e463ca179a6847771fd. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ7Q2590105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afc5d39c676dfa8788a512b35dcfe2b9ca6fb76dd5ea903f89958c00c3b2445. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZZ7Q2590106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f34b3d202672d174cc33e6a2e23dc06f8fc1d69d3bb31afe00f8c42f755307. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZZ7Q2590107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d411a216c50d2bf71b4793228d3217f1343f67c8df5c87d1cd4bd0b5187f86. 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/QZZ7S2594839.