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 0x503e3faf4511562a4df4bf9da6d296ff530df5986c02e3e951002c44f144b124. 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/e8b6599e-c033-4da5-aee0-70452277f61d.json and https://artists.proofprofile.net/proofs/artist/e8b6599e-c033-4da5-aee0-70452277f61d.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 0xce473e3f9fc3780b9bccb23fc34d541e42118dbb999e6bb873601744406aabda. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAJH2538137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67430bc8bb359d578c79ce584d0c1b0ada49eab71d54fc0888a2ba2b4c060384. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAJH2538160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971c00430dc672ed984b2934b83f4c0ff61d5c2ee70efbe6f21fa6a9e83d23d1. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJH2538176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d1f5ac34c5c11094eb2962bbb5371a4f25b2d61e55e52a8100826f295eb508. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/TCAJH2538180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3205c1a1cd76d27fb77c546dfbd812dffe950baa0a0c17bd972200e79e1c680. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/TCAJI2538184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fed433762e015c52d29050481a06515f1129143f58b81c5b486a1129435731. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAJH2538187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8366a6e28b1825b1a3f8c012c59a79cb80e5f5fd7991124f8a282e7d459fb7. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAJI2538194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218a021c0e73975f22308dba9229ffae3b0018763a51e5ef3ffb388fbb889b0d. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJH2537950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f919118385d66c512567ca7fb2ad39be988e077b4e32dca371ca0a863de7a5. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/TCAJH2537970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3394ad4d6d938858de72c52313526cc0ca3859a22443696acd6919a35d58fef1. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/TCAJH2538023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c68257fa2f07f71624d65afc81853a53986e1e776b55953beae6027ba96c304. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCAJI2553302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326e96c4bf09e2236bbd90d2d98bffc1f8e34f621f24471f93d07c0cf6ea40b5. 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/TCAJI2553308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf901c582abbd63eccfc8c8c7b3fd5f3d54eaf1b597b1077ccc4054a65ed0c98a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAJI2553319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cd480b4a76318f4b6b261370fc84aaf2ec6620524778ccb3341a43dc71d973. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJI2553326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f81c2cd5a579d5bc33c59ddbb0fc9f1d354a461e80a42996b431e7d5b4283ba. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJI2553334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc223ca0d6407306e1b179c88c4b8475a4be0f621301ee08cc5a74c0059bdf950. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAJI2553344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49fd72e42944da7fc5aff9e6ea1ba6291dd8793f93816fd12d73c61cc73705f6. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAJJ2562429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8537fe3ce7fafe3407c6eabcd57fa3145d14ab4adc051463e77c4bcae5b751c8. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJJ2562434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9e79acd048b0d51c0fa32d7247b50157ede5fb2b38b2c8ff4252359f57da7e. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJJ2562436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ea9768585451f989b02ea32c3e31e2356ee162972ca4759e8068dc8c8d99d4. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJJ2562441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bf9a223cf4b0ab81bd289226fe716df952d7afc622628b07158897567ece63. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJJ2562447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69307350e7ebca6695faffc0418e8898d62acef34eb4cb55fa28bf6e3cac656a. 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/TCAJJ2562452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9875fd912fe5aaf8ca0c9179e0569da66676975276b629c1a2c75af81a339e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAJJ2562458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074524639e2ee7915190802f4b4a0db1b51d25fb3ba1dcd6e9a1a25840ee9e4f. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJJ2562462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd385cff797b97d9d8c01e5813099aab6f45bcde37789bbd07444bcd585aa27. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJJ2562467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa893f4bdae5b1e347f79f1abee872e3291fe43408eb568ee38fbab0fd23c4b11. 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/TCAJJ2562471.