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 0x787412c15db5e52e04c46c4e6ad2cb93f7523714d053cac4d203ce7f0d49e30e. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/30512e94-1b77-41d1-b408-f31be8c614f4.json and https://artists.proofprofile.net/proofs/artist/30512e94-1b77-41d1-b408-f31be8c614f4.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 0x6cde3b319a3bd9faed742287080526982c2ee2eaaa6f598f84749e28a2845338. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTAY2314997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a712d512f6116626a3263bde87f9bef615986b657aec8fa006dfade5edc859f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTAY2314996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dac82ad4e5530bb88b0ee40b7dedd2c141a4e466f899d4293b24842e377b637. 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/QZTAY2314991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90a79adc212123710f5abe644dcfbfd14a29b53b89985ab361dc4f26e90e419. 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/QZTAY2314994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee7dd3cd6ba0a1c6e926227ea2734c2abf5b0b63d1b49226eb05ed7682eff58. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZTAY2315003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a62f11ce19d5e7bbddca4e859516a8e7b4ee3f869e3d1a69241445d0e47b15. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZES82408637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead5643c9dd1d050dacae878497eac0fb3fac9adb613e558abc3194ae3ab3c00. 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/QZTAX2380759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e8c8f96a5843f7cf0b4fd366bdd56ac2f03e54710730c029860c1a3924bc4a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZTAX2380763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10de7fb6027d71133f277929d0021db9f68d1be0aaf9db00bf8aef7bc385429d. 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/QZTAX2380770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadaca1631b27b012a19dd35a694029ac09b35530b0c6a57cfe05ab5fbb2dfffb. 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/QZTAX2380774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b7d605f1f592cedb6c6d7ec44c54e43c747d59f2a09492c2ef8d4deb6ca0c8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTAX2380853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8556a205b8f42ec7f6b4b29f1fa53d333e05a252bbc395c93764819a4cd0423e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTAX2380854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3db1527729f06e33fb58689e80198661a1c166637caa960368ae2d4ca8440c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZTAX2380858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc59c1a4ea9e1ab7025bf040c8e6fa2e410ed0e334efc1e0d1a5fd8d7a0b13f. 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/QZTAX2380859.