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 0xe4c9046c7fd23875808535d59b32a37455921f9f585de613351aeea7960d33b4. 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/e5db7af6-88e4-4ea6-8d5b-646850a4bded.json and https://artists.proofprofile.net/proofs/artist/e5db7af6-88e4-4ea6-8d5b-646850a4bded.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tình Ca Tình Ta (Lofi Version - Instrumental)
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 0x5e12e710ebb52849d823ec1cba4a7bdb6b1c15d1e57f1db08cf8bc9e4f4966c2. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NL3M12407059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481145f1c873b7ddec8792e67991635efe0884ee21848e19bd5efe565353ecfc. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QT4ED2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcada992efb348d28250304cf543c0dde6eaf4f003a0bbb75629912061cfb8931. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QT4ED2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f49615d9909f78dccea81e41774cb4cddd21be8cbfd6e6e16262cd78ee7ddf0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT4ED2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f9fa605056d1251a75524dc4b853208fc6632acd830a963406ee207cc07bb5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT4ED2500061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c8fe3f053c841af9126cbb5aa657a97423c9c087cb4db449b651e2fd88b85e. 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/QT4ED2500442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7879fa0e303f51b62f7eefa39b0a65c9dab15cea0a5ac0d9b26e626481a40b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT4ED2500497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe92a38677aa639e4121a75f8f0e395c6f4cac9af81ff7b254c1ed96f381ca8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT4ED2500484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25024e93f4b3b4764741b87403f8abf8666dace1608803d4b669ad5925dfce0c. 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/QT4ED2500518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b65f97974d4880a4c78827c8041bd5c66d33f3af3b83a80a63e1c1a8e707896. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT4ED2500519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14295f5f5f9e594c7e5ff4b223fe74f0805f3c8976ffed1334befb458449d1a3. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QT4ED2500523.