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 0xb3353a91032fbb7d9ff08050e6b8ef34195ff98cf41463fd349aa30208362cb3. 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/c1a20861-1fc2-4e81-a42a-aaa6af2f0fdf.json and https://artists.proofprofile.net/proofs/artist/c1a20861-1fc2-4e81-a42a-aaa6af2f0fdf.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 0x16094ba82cc1b8491eaf5243ece23c436e17079eaaf8b26b25ba1f91067e7a70. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UK3AZ1818375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf636f7ab2949a50517f964da951e9f5165bcb23899c68bdf53d4e222013880df. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/UK3AZ1818452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd04c841a6f4b9d612e439974077e1981ab9c860685d75cb288ca9244607dc3. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/ZA56E1900073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4312d017c9d6d9fb04182d596c43d80ca824e76d103421041e13ade914b15b58. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/UK3AZ1925538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816b95ccbd46fe4d16c44cc7d3f207d507509716a2caa51865f60d109e1a3f39. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T16:23:31Z), 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/UK3AZ2027685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eec516a465b30c3b71839f64bbb5b4173b027447fb932e3e262f91d45659b66. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:31:14Z), 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/UK3AZ1717222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4312d017c9d6d9fb04182d596c43d80ca824e76d103421041e13ade914b15b58. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/UK3AZ1925538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956db9de9785ad0c5950dbe1619fe8a4883770a94352ff9640e1fd27814e8159. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UK3AZ2029394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6a068fa1a7848a46cf08bb2b0d03c11a16905c37d95a8b16c913d82902b716. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/UK3AZ1821573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84259eea27c3ae934e7d3254d0375726fe482932e59c1dd9119b8e57a659c14. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/UK3AZ1922939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f29b66d53dd9466723bad7e9b9d692c68937d06701c185183506da2457f268. 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/UK3AZ1717221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaaa83e521b33257ecba8b705510c4c6ecc8a8e0e24f1b951de711dcf34ad4b8. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:20:54Z), 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/UK3AZ1821087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e084130cfa824cfdef7ab00ef911ae8d08939c7b222cfd700ea7d8283c0846. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/UK3AZ1820527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b930c57aa8a988533ecf2582fc5a01ecf05248fa0ccd0796989fa8a5bacada. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/ZAA6R2000110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321811eeb2f7cfebe07f98992a751399b1ec2306f5c885fa9b11864cfff9cd6d. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZQ4X2100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05345d88b51aac8a53c6e71384b731bb08437db3e7db187084abca3de63226f. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZQ4X2100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3253af7febaf1572312203d9daba1c04e03421c273308130408189ef5a43ab90. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZQ4X2100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2687f888bea72aa91fdb88b68731632b6fe5c65ed8bcf8b9bf567827136ace1. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZQ4X2100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5019c18822113230f1ea4d7952fb38380f43021004309cbbe42aea71579b86. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZQ4X2100065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1db86f05f5d90ae32f7fbc3db47302b1abaad94b6cc65c9fc845f638a78e88f. 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/QZQ4X2400433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4e455c2a17822113b779322ed052d206827cf9422a00fbeccbe6f4aa3b5d50. 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/QZQ4X2500349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fbd8ee2adc7590a124d6840d182d1b21d25e6f51318b7c1f4259752f4c9b23. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM24S1835538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706ed1298905addabeb1889cd253d08a02c3a05b1eaa2b4e18d2c27bbb9d51bb. 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/QZQ4X2100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84259eea27c3ae934e7d3254d0375726fe482932e59c1dd9119b8e57a659c14. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UK3AZ1922939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321811eeb2f7cfebe07f98992a751399b1ec2306f5c885fa9b11864cfff9cd6d. 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/QZQ4X2100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956db9de9785ad0c5950dbe1619fe8a4883770a94352ff9640e1fd27814e8159. 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/UK3AZ2029394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3253af7febaf1572312203d9daba1c04e03421c273308130408189ef5a43ab90. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZQ4X2100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62fe0835efa4b46ae2594742a6550194c3b0eb105a9b27c6c246811ecd79d199. 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/QZQ4X2100054.