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 0xcad9a4ced21c077e5acfbdef474d148f23138ec985cf7812e1cce421b9618fc5. 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/ca653f8e-70f3-4aca-a4a8-6cf1a2a11803.json and https://artists.proofprofile.net/proofs/artist/ca653f8e-70f3-4aca-a4a8-6cf1a2a11803.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 0xc73cdd6c7663d89f6ec9ce7202c7d8124fdc473fd015a5d55211f3797a9a1e65. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCADG1743037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65efd7ef048c47ac2247fa4517514570bb821a52df2c8745b63f1033dcd3a0d4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCADG1743012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c22a0c3a6d6345b9e570f387ce84ce882d5b1fd0f574001ec6698f83319f06. 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/TCADG1743070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895a7ef9628a3d1be3ad8dd117158e563dfaf97b1bdfb8a153ffba131136c820. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCADG1743071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e0f06b823f5efa54d1e565c6f81d23d3790cf85e3f7333c9c68f9c4bdb1f33. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCADG1743072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf9e187375e942fa4ac63bb861d56ea946d4a1a5c4bff06de0d4ce145fea102. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCADG1743073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5e55d2b3f8218bd48f5ea42fd4633b21d51ac573d003961f7da4d5d133ebab. 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/TCADG1743075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b867398172d882f35d0df887f7eec3ec6f739eeaa9929f7ea33181d153506c. 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/TCADG1743079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe088ea7cfba972d475717d5fb79509351039be7e4f6dfc0bda33013e23df3a0e. 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/TCAEX2011192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1157e754f96cc72f16f9f2633512f1a5c042dc3a17050080e64994577245448. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/FR59R1742232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02add1eea29f5eb83fc10ab834127a4c55a96d3de2c803c8f1bcb828e922ebfb. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FR59R1742236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9307086e11b86d54489deb9ecfa47b1a0866c904b7242ee8403380327a93f23e. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/FR10S1604265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ef68e75425ccbbb892f68a0c4300f9f2fc017d2c74fbe6ba4864c6898025d3. 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/FR10S1604268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d480c64dabd0618a70bcb9e0fc9f7eb1b42149f255dea71a4a68d476606a74e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAEF1943380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c4faeba2464e63db08e8e2cd7e70e1b21ac475da2cc9046f3e10c985499f6e. 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/TCAEF1943391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df11ac6977d1f8d9b29c4f5ad34a00b2fa08edad8200c701ff7fc0d6a643e24. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/TCAEF1943397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16265bba674faf2fa97c64c8613d472a929c27e910e333ef97ac68b44b5a0caa. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UKMLV2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534db83b33b41718af8643a74fa1da864e2e3fccc147a049a3ac6417cbd711de. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/QZZ7N2431323.