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 0xaa22cff8248f583915fae55baa44fa2e7c0d050b4d41cc9ddb77c2212ab841bf. 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/38d26e07-b5af-4028-b4d9-603076cf4871.json and https://artists.proofprofile.net/proofs/artist/38d26e07-b5af-4028-b4d9-603076cf4871.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 0xf905c84b65d3d8b85cb5b3aeb871991b889452d6a60df04193126d9d3469972d. 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/QM6MZ2402319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10367c6817a658f105e64c7866dc3fb5b437ad88b0dda5464a88ae065c57b9c. 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/QMFMF2379628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0601d2e547d70a207f3caba18fd83711f8a76176d114b7d8f342952af16ce8a. 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/QZZ8B2342033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5779032543ba7d362a30eaeb7bf090c16032fe2f703afb334cbcd4ffec5a6474. 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/QZW9K2332692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95e28adf62f9a42d60bad33e246b1ca25623d288275521b0c3afb1ef16417af. 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/QZWV32373973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87281305cafc5650c0bfa5c1dc0398caf6e8aa5349df86ceb9b006516b939d1d. 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/QZWDE2381342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91cba9a07bfe0df8e0bcd0d08a42e583d7fb07b9ebb73813fce64363f1034a78. 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/QZWDD2376222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4254322d29b4efecddc9157b67530ba57d3581a5d785ae9483743ff6ea76d7f0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTV32369598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ceb1c8c868f177ca6979f7ce0d28a92329682d690324b12234886f91199f1c. 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/QMBZ92328610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5d27e5cf5c03128c1d4eb3fafeb8799fdfc313d1cea21b07b872f93a9ff1b6. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZTRX2392863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f6d6d6c0c61962d16e14a538a44512526eda640716d5b605877b66cd9a1954. 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/QZTRX2318043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311ccfc2d9010652b8c7eea38c0750c234205ee5acc8e8f45d8c452847a436a0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBWUL2390822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9cd415ad258c80b4ecfef2bb69fc56e20044aeea7d238101e5d42ce5e0d5f2a. 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/QM6P42331294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e8ed7b70605962e0973527b3877e7bafbc9171c188b7ca9fbaf29dc443acca. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBWUL2306909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11aa4f6e299a39772dc187db3693f52378bd4786a416f95c4c7932ccfcffb722. 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/GBRKQ2394510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45aefb589cf933e5883e94cd51ceb42962658e1e9835ceee5883fb7d25dcd69. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN72366559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095fd6dc324909a0679b7eef1823178ccff97dfb943043c6a0012b5c7e7c29ff. 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/USLZJ2354655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980cf390dd3e9963646fd66e42f2d2924e9a4806c450f7893331cd586b8b1975. 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/QM4TW2365041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9470e0bb971e36fc39fe968b2f7c2f1c46c87ec743171a4c590d1b6dd7d403cb. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QM4TW2368279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf498c989cd448b095e98803b023b062b73948b10d5de1fafedc07ec5cc7999c6. 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/QZ5FN2324881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fdc6daec33a4d9375b2e821f11343b99c69e8c932d585658fbb4c9a9c20a4a8. 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/QZWDE2249771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7164487825633acd74e3b1f7e37d59b3144c77f20019256c45251f6eedddcd. 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/QZWDE2245797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98f793da4135ba8cc5ce74578839616c5f2451e367513d8008be331d77f7e3e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZWDE2209495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6e86d1ce8a84be3ba96e072a5380b74cbd6e77dc850fc46f0856b12f06b061. 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/QZWDD2443321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd056f43661d8d0062d25f0851ba8cdee94dc53ac85ad277155a18298e9daeee0. 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/QM4TW2576539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a59d81c245be35d3d5de7bcad4d8c8d47473d482fb966f7ee0ded1fc5f3e77f. 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/QMFMF2464786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39663175f1c982cab388301cc91a1f901ec57a1e8485d764df64e547e4f882dd. 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/QMFME2411453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a4bad47971e245e9abc5f21fc6bd8486831583107e0a9fb9cb2631106d9210. 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/QZZ8A2479905.