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 0xaa80e68a9308fcde2a488bd9dc1dd4ac926ca1fe4dca615f2032fbafbab79088. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e053f442-deed-48b0-9fe4-fd276fb65535.json and https://artists.proofprofile.net/proofs/artist/e053f442-deed-48b0-9fe4-fd276fb65535.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 0xbef1e21152f0131c0cf4cb32e8064fe261c3ab07f1f0b34e0f2852804f38efb3. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZDQH2362579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc1aeeab7c7725dbe619ecdc4a40e9f23ae76ba057ff6e0a5799de4281246ee. 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/QZDQH2361270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7abe6e258dca7c1cfe6f57eeae065e5d72f447051f36c5fa9d6739988c2a3f29. 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/QZTB92235059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1185318ef1e2f88fe7351a5693a504722e367a9fd74d9a3782f6ad6c6a8993a5. 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/QZK6M2215276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386c4659176bac31b46e334360047781ff3c73fe26f95addc5f676dc17f78944. 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/QZDQH2416607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae6f5a8429949ad482cc74dce14b11f9933610df0bb2f85dfa531c65346dfa0. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/AUMEV2448736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c98571c3f40439af8ea5548ea8b7ac5d446e60be4d3624a5c77494097c691f8. 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/TCAHH2347406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538fe75e7f13a6eeffeba7b60e2e8e01e404807d4e4d1a1175a3cc0bacab31d5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAHH2347593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc317032e7ea4dc0d0853737647ad6adedf409098fa384ed01d2fe226c1968a8. 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/TCAHH2347686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260aaf025165869d1ef7c9e5f8ec9c5789ccc992d74b5078f0e61529768e9323. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCAHH2347718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ddd620fa5494016ef8beffed47ffcb8e5bc1b2f1db37e07823f47503c2c7347. 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/TCAHH2347729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9565269df392dda6b65e76255dcc08f4d13495f385d43d70a3c77ec5c668dd73. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCAHH2347739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a986288b8c27ca2cf4da29ae48cc41ac111739f8fb6aa81437b1eb3d6a3f097. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCAHH2347764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c351c6e178ed104cdc398596af27ca052435c81d3f9ea05f96e8598df36a77a. 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/TCAHH2347794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919d32f3aa176ba90124eed887b3fecca6036557cfbf5e3bd112622b8841ca53. 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/TCAHH2347801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e80527b9632b5fa1d7610f2ad00dc47fe2ae0ec5044fabe4dfcea4eda74d729. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCAHH2347829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b37c8191f69b93f077ef767885a3e448f87807d4b886bbd7b11b1d4330bb5b8. 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/QZDQH2383231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2e58d7ff46a7c361b5b427dd0ec8060b17c17931448503334aaf2377a8990b. 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/QZDQH2383238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f213593bd606c920f6b5aad0c01dcbeb38d87a91ca847d58d16d248f656869. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QMBZ92282541.