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 0xa0680d1f1c97e65ea212d40ab7dcc89468759c45b163dcf1c4519e57a398746f. 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/4647a0a6-8bed-41f1-9c5a-f07d0c246b67.json and https://artists.proofprofile.net/proofs/artist/4647a0a6-8bed-41f1-9c5a-f07d0c246b67.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 0x1accab4e8273d77671e7876f573fb84831585eec01670bc8e4f7cd0a29a99e56. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/TCAEI1969382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a7a5fbf1d1181cf000bc7b53a57fe395c41e6d337c5c90c4c2107eac21e34f. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/US94P1212902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90baa5a03396bbb10247eb29da9c68487febf4f4f3e0b4bcbb7d6b728c9ac29. 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/US94P1212903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046057db209ea0c271dc9fd46748598610be217e1ecffd623d6963a7510c2186. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:38:14Z), 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/US94P1212904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70045012e7ecbd4f49c8c00a5212f596631caad39e5cea224ec936bbcb48ac4. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/US94P1212905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5427ab64a75078a633ddcdc1866a87a80b395b260b7f40af1951df6d8c3b44. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/US94P1212906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a70b64dda16eba4ad84e23124e2d5a3f5c220e395c683657fa6e52b7e56ea59. 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/FR9W12101350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56eb1e62c73bb42ecf0d649724d0ab001b998f8f5fd62d8e012e07a6bf94926. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12101351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaab1f3286a43334b9f59a19dba5241cb32a609961479ab37bb04d895da53b0d. 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/FR9W12101352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfda0a0c5c23a99010f53e083ac0692c153177f2de0c6b0d175374b01bb79d83. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR9W12101353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cf56e0622cff1605c2c1857be6887ba435a795fe5f2cea1e030fc656b04d69. 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/FR9W12101355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6762d6c609091f7364ae61c16bb0ca607d0474f7f57aaab61cfc0dde76a07f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR9W12101356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b32d26b83e3fa39563f4489e5e3013daed61272a508bbff6b540585459c8d7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR9W12101357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc75030451e58aa6dc4d15c5ae429f14cc11a45bff91c944fdee48c2bb3b116. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR9W12101358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd56a32386970d7e0d83aa74500f620f82c505b9746f7ff2a399ecb9f965118d. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:42:55Z), 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/FR9W12461032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b92d84a3f7b497b34d9533247ddc9ca9e567dab1c1e8e5cc6273025100feb5d. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR9W12461035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e850b240a97a7c787c12ff07a35935ece41bdd667d2f79d7791343ed2a2e8e0. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR9W12461036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3017faf7f94d04a5858425d9fe0e357419096d0a18cc542d5003d4870aac2e1a. 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/FR9W12461037.