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 0x55a50e8191f21177c6ec1d0d4f126de8445d4a6e51a3f40ebdef3934e6b4ce0e. 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/dac2352e-7f08-4fd5-8fa8-895a36697c6d.json and https://artists.proofprofile.net/proofs/artist/dac2352e-7f08-4fd5-8fa8-895a36697c6d.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 0x8db7238944ba8e8bd4755ee3e94ec8e15822f48e1f0d0e21aa635ada77999fe1. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TR0410801266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0942bb5f6ee3322f538cda230b23c8e2f2e76b6c6c64c2ac1b501c6868728f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TR0410801249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0089d197449a1044dbd1ec824a71275da34a3e96f5554fec779135e436355d. 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/TR0410801252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf573497a8337acd59f3f3916001cd9446c582dfa7bc0e353f1b3eba4c134d580. 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/TR0410801254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7bd778537dbcd20b7f3542516e14e6bff0914da9520d8275d790d106386194e. 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/TR0410801257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398a6ca20eddcb745c06b8daca07a876275341c3a35140e774dcb41d71e6a037. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TR0410801446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3375bbb4d29fe2c0452e949b71e015c6f3a79561e105182b1d84b8742cb574f. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/TR0410801447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a47045aea0232b2bdc9172b54d43cb5c8342f4e8b91237f0008d8f73361d5ff. 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/TR0410801451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa206ed223ebeb3428ca2fbca4382a607e49e8c40379d1be3dfb59faddaa616c1. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TR0410801106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31c37f3b2c4a4a2f9db530800dd020e01d7e1a3ab22abec20bd2c0e88ed5046. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TR0410801107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4f5e11317daab096943c44cb22580cb1e6279caea3c02990990165c69757c4. 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/TR0410801236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd77b35215a878cbbd9f063d66e33b96747a534c6a5f64cfcaa8896e9ab4fde. 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/TR0410801239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b0b78aa2305dfa0d9bd495d90ff50d24fab3dbd6301907269cade3b35eb6cf. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TR0410801242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e9bbe6db51da07b8d9c43dd8da5f49f68efb30c857f298a2946af25b63b86b. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/TR0410800876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37524ddb6fc889beb624d336da58431180d4c9d78b53ee717b664f3521439583. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TR0410801412.