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 0x8d6a74db1dce254991230024abd231e0109df7462949aabfc050d14b0be45aa4. 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/6057b55e-1dd3-4b37-bab3-4412b1ce7952.json and https://artists.proofprofile.net/proofs/artist/6057b55e-1dd3-4b37-bab3-4412b1ce7952.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 0x1a2d13a49a68fd6f4c45a3d84c558309aaeae4d2824dd60c2512a68eac8ceebc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ5AB2309108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8ce0a528f8017f783db1da1faf77a2d12eba5c9aeca839ebe397bb2934c818. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZW9N2262226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5122355f1cf0c1ee647ba13c7aad8a667db424898cbccaa53d6c38854661cf14. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZW9N2262227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca02383f568f388397a84fb6a972327273c35cce75b46c70bf05f257b4af1a50. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZW9N2262229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c73d05c76bef76d26bf5efd8374f1d18c0df9388fd712dc7030d703d51d7d8b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZW9N2262230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3cd781de1ac9c223abb199a3be54e3bb6bdb28f3fde896172a92abbfb40cd5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZW9N2262232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6a33e15f2b477ae0312ea26429408f0c6901dc9790c7e92a70ccc31cee1004. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZW9N2262234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a685738e688d7f316023a768dd87d0a2006846fcb490acb89f809d630a2670d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZW9N2262235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30677dc9a32e1748ac817d978503cef411f41b0c13b870ec0887ae2f2c03a4e4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6MZ1824505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22368df40b8cdc2ea33d22cec262e53c68eac4af5c215221c77326dbec666025. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM6MZ1824506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b57ac45f38deff4254bc77196be402a222f28a6eb745e4a54f30d180d2f640. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM6MZ1824507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f36e0f04fd8242591df8e802439a296a9842e6c471917513ae8a0df8468d07. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6MZ1824508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a97e44928ca4cc6313e481691744fb8f1e64ca193c97ca3dbb289a43483951. 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/QM6MZ1824511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f5718e693d3792130cdcd68b4c6717d7387021e450fba9577d4f92f0be5002. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6MZ1824513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb40ba96a3ec4823b43e9b91a1cf161726558cccfdf02045964ffe5bd19c897. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QM6MZ1824514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b0e69fed231f338aa0c493fdffba9e922ba740d097d8bf465fcb41fd7f1b12. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM6MZ1824515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511b977c2c2f4c5f003cc93f39284641265a41e07d4abd7700848bbe84f9048a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6MZ1824518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7570db1409c5d2bdee6e30f1cbeec6fdaefd82228db4a9f950f44b21aada7ab3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWY2020667.