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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14709cb5f9885c54686acf3d61382c03bfc4eec4fbea4963039a3c588974d0a4. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3fef179e-b22c-41a2-9821-c79e8abbb8f5.json and https://artists.proofprofile.net/proofs/artist/3fef179e-b22c-41a2-9821-c79e8abbb8f5.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38670c582542c28d9a3eb643b38f894c06fc86f96ff6c6497d6d375109d185d. 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/BCZ4X2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26d17b917a72a42f08b59fa4dd6a31fe5187dff9302eecf31f5aa3c3532f228. 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/BCZ4X2100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb96bf05a9de45d91be4e533d477017c84e44673d7acbbfe39a0eba4fa7dc1b. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T11:01:03Z), 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/BCZ4X2100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014545f0c3914a38a72dfe8054f9b013c7a0f688a14f2d1bc5fecb522e799f88. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/BCZ4X2100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1582ea49991e0bf9b724ed90c57b0a6abc9684a14350d41195f19968bee27ec4. 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/BCZ4X2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef696fa2a2549967e3aac209fe345f8f2eba061b94bcf64ac1ec5cddef27777. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/BCZ4X2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66bb8597aada886ea12d4fa60790623abcc9f5f6d33e11639f593064f665fbee. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/BCZ4X2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78ab617b76b05765d1c65c2ec1fe9d15293ff8b11eb3f48864640710551be5d. 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/BCZ4X2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5a5bbb40f3758783f3338116599a17dd988dcac4168421cc988bf92cb6d85a. 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/BCZ4X2300092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa653c67929c8053206480e76977d01f5c216ba1e783e6ea8ca9732da4077737c. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/BCZ4X2300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be7a15f4401ef34acf53e066d8c53c2a2a569f890a3b5c7ee3d78326670ba07. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/BCZ4X2300096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9fa483500ff6411a070b2e650bca7b9940bdac377a8ed89c29de72f4301784. 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/QZGLM2566467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05c62839f8bc2a4a59700c72417d721b954babcbb20d3fd820cc5abaaf4e23b. 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/BCZ4X2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cec912fc7c782216535b599dc2de57cd7ad7552b08950fff030caf216c07205. 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/BCZ4X2100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cac74c8735202b81c4baf3d94a2d721ed16ec313272ec2fd3612bc57fe284f. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/BCZ4X2100051.
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