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 0x09c3e832ad5e14a385e83be09e0a527f090595c398894cfb254ed21d2951098e. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ee5b148d-9f29-41c9-9d5b-5107e6d032de.json and https://artists.proofprofile.net/proofs/artist/ee5b148d-9f29-41c9-9d5b-5107e6d032de.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 0xd9e961e66465cb9d371df48a90dbbfa25c501a28cbf2b9203e2e654b6c9ac503. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NOPWE0501030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95cfc9ac61906f37c6814dfe29fd90f3014d925f5f245f98a127eaaf4ba35534. 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/NOFRS0302060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59258b5334e1fd88b96683636cc18846e2f8ec848891b8d9a4bfefcd006136c0. 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/NOUM71400428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725f0b9b2a102ec0b31088d2f66c296d4099619c9e578fafaa3c68e641afc8ab. 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/NOUM71400430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95cfc9ac61906f37c6814dfe29fd90f3014d925f5f245f98a127eaaf4ba35534. 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/NOFRS0302060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3bf6786f20f7e20686a4590bf8e169bc2328c98607082e091a345914aa9686. 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/NOPWE0701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2224d4aab3e5596f12ef96f96628f4c227e3363b962bd801b564f5c4a76e1b. 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/NOYEK0301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518b40c384371cbd46336bfca7a81ebcd9370e89a029fad75b017fef84f78c2e. 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/NOPWE9201010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcfb830dd99fdeed1e442428b5bd6bcef56eb4d320a93a6aba38b2723092830. 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/NOUM71300319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc74b7dd151a51ceaf323045c21936bae1e645af20c341ce53fbdfa012f30705. 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/NOUM71300321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbc48fbe1f9382e323e1c5f19e37d585ef014d8ab99c2e3eeaf5de0b9ac23ab. 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/NOUM71300322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94a8c8dee45b04b6142adc0b9c7f960e449aecb33002ab30f2f6304e5b49668. 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/NOUM71300323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184936772c78d11a14050cf5635af8a3ccce01df8f7ce86f1aba8474032baf76. 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/NOUM71300324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117010fc5e85d4d6d359d9362dba5862d883f6ed43ab97a5e97c2729742b72a4. 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/NOUM71300325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a507d15710d03abb8e3df5e6c623f2dd52d7633dac27279d73231ffba838586. 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/NOUM71300326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b53f3a9dd63d520a9faa5b34ca37666757a4b30bfd883d521ff67d21719a064. 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/NOUM71300330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b3a84e1f0fdabde567f22e9bcb739d354ceee7ea6534bf0c00962aed72aae2. 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/NOUM71300328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267f49f624281ebdb2e54a0541e18f305e571773bcafb712a41b4c8c6b339869. 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/NO5FC1303090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418a8777b2ca0613963cd2afc8daf9bb29ab73b89b93886f3be0293247ca180f. 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/NO5FC1303130.