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 0x3d09c4fd62706fa8c7e9759f9f9a6aaa9d5590abe7b97fc8cbe17ccf19d5ddb1. 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/052e8350-d426-4c4b-b821-d0b0b4752399.json and https://artists.proofprofile.net/proofs/artist/052e8350-d426-4c4b-b821-d0b0b4752399.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 0x83d0ecde4a644bc6881c86d8a390fb6cdcfdfcccd73fdb1be5063fba24d65d06. 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/FIMUW1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd37ee2182d319ebeee737e6a2b8d70d7ae5e92d61a8da7749905278c1a20b5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FIMUW1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a33ea41e87c4157edafbfd44f51df865f881d15633f8e92f43f56f0c0f17da0. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/FIMUW1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424c2520b9a00323ccbd0c00bb027984903f0566cd2636f4dec394ce1d3de621. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/FIMUW1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1525abbdf1700043bf47cdf2a9a42a444826259401cf4048013a75187557bcd8. 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/FIMUW1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5989ae12c3f9e4d618787c81e5d4bc1fa3842424a6d9fc6dac36d305ed6a44d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FIMUW1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f770c0234a2bfe407a4b5f3dfd9527914139aec6467f7d60bdc5079bb1ac24. 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/FIMUW1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bd644b9d248e70ebe2b99154671d80a3352f8561f8bd68f441a745727901e9. 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/FIMUW1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab6c2ebac9ff28f0fa4cebfb042c75552b2bd73c0a0c2126feda9167ae639b3. 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/FIMUW1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3660ab203fdb2587c40fcb7baa4889b44009b54faaf9854e624a0110aad28d45. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FIMUW1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9296e5f8ddf745d0b9264b7563b1e4138e2ac90c5eb18374123bc288df75e2f3. 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/FISAI1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9678670a02b32c1962b97e6678ecfc5d4970dc1b89c937cdc4183c2609f0f2ca. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FISAI1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b759dc665c786fa7634080546a8a4d10281e0298aeab01984541e9cecf26c0. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/FISAI1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20f19dad1e406fc36d168d7caa66da685804323aeaa9f291416d4de25609f48. 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/FISAI1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0720b3c505911e6f624d0c7b627b1d28f3b66ba282bd0c45422f34f092b3281. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FISAI1600014.