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 0x2f42dabe6fb39890f480886a736ff8c0aa223241c8561d128a64869d3627f28e. 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/d6bc2bbb-fc63-477e-a614-237b1634a0f4.json and https://artists.proofprofile.net/proofs/artist/d6bc2bbb-fc63-477e-a614-237b1634a0f4.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 0xb45960eaaff22fca77ea56441e6f52666c0b5660fc83e2d0f03670cc30594e55. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCAGN2241403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42363955db230b232d5e20eb34ba35129f6e50dcc3101938794994d0ae68695e. 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/TCAGN2241470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586d56325bdbd0442c107e68d85fe22a704ab939a91ce752ae8e6ed090084547. 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/TCAGX2323684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf394ddad3711b4f293298c3e16d62f6949b1272cfa8543455b65fc2ef700b9. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCAHE2316100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c97837adc6d006adfc83d80b73ed383859e6243406b1e65e13754c4c1b9f2f8. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USLUU2301562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d952c5939990a9195568264fb90a964d6af96361f426004393fab06e78f1f05. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USLUU2301632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4111bc9d9519d89c61c22f4db9cc6dd4e712f3d52cafe2f82db90a56c16761ee. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAIR2437271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd917921b5f7d9e213838a27bc6d61eca6f9d559ea0a6295e67c8e957af734cd2. 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/TCAIQ2490848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed190c5ba4b4c965fd82257175c0cd98ac0041a94e565e782f2e0cbc9fe3e9a. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/TCAJF2507732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74220e5f73787fb5859c0561bb2c0289f0f9349a0b799b9982a5643a5482b52. 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/TCAJK2525242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99b6e90b73e04e8ccb6a7cba96fb3b5e50a90e5840b0d730ca61cd94ad7b729. 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/QZQAY2504269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264a754807efe0be6492edf8980ca490fd34a70039e9c7d529815272010bab3b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CA5KR2585921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf686f1edfa8251517ec47afeed726c946943d7e2c9a045f15c61e1908cd39b6d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CA5KR2591796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb19a55252759235ded0c5d1e7c28a26e8f8a94a123ae3132844a5787789d12. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCAHZ2482226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2756b10d48ce0da79f19c1db423915341925210ae2d64b5f1e706c3f2b0bb1b3. 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/TCAHZ2482260.