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 0x7820d0e825862b04b119cfc2bc145a8e1b1b069c382af8b955adb6a41d9d2b98. 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/a073d0d5-93a8-4027-8de3-29533f848d62.json and https://artists.proofprofile.net/proofs/artist/a073d0d5-93a8-4027-8de3-29533f848d62.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 0xdb85d9087650e6bb924458e38adf5169fda3ad7f5564d6d247e438c91bee0e01. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/HKC371600170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a70a916c07b80156acd826fd4c91a7c491fbf6b034a0635558efe59d2f52ca. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/HKC371600165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0011351372fffece5a3e204cac6005c46cecc62205b47397649342bfd12f7b8. 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/HKC371600161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597f3a4bd62cd55e1b03cc0d20f8d8a07c8fcfeb4965bb43706e9d86ce4ad491. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/HKC371600163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cfc97a4beabd027e498f3785c54fad6b6ec7cf93207cb26c9c0bead1a39c51. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/HKC371600162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b220d8b36e45eb3ce709ac88bcfea7107addce681366bd6f1f62822587b77b0. 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/HKC371600164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27667239ffacc146c55a678c8c473c5691f5333146d367133a2bce6bd22008b. 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/HKC371600167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa942aa66df8f878d9285dfd375a9e1d14bd2e417daae6fdd7feeba9d0347ecce. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/HKC371600168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dcfba34fed317b70852b9d2ecaf4b7bc6778ab8b42bd3b673ec83999eb7adc5. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/HKC371600166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83adb3160ab1cc924aff54000cb62bdb20c963fe3ff35427cd0951e8ab9a3d8c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/HKC371600169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1aaf717bc65c7e2c2defd4fb800bc12e5a15144ed0dab58b0e4373ac989c156. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZHNB2450946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7780b9cb973618fd16458ae3b5056d84919ed2daefc7bc09d9637eef2437dbf0. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZMER2431339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9ce37bed75e0a541c99aa9b3449589bc4a6e6266dc5bc1071b89785771b88b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6N2414045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc46c997c57088ef3beb0e0f9b6fb8e16424794ab49a58b65999d51c20e7825. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZMER2431340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9ce37bed75e0a541c99aa9b3449589bc4a6e6266dc5bc1071b89785771b88b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZK6N2414045.