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 0x1003edd993a6b60d2ba8d5b283f133c9f1d8153ec00d85b873c584ecf67260a8. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8960445-2901-47da-8f1e-fb7de74cb4da.json and https://artists.proofprofile.net/proofs/artist/e8960445-2901-47da-8f1e-fb7de74cb4da.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 0x48ae14ad63912cf1736a3196d76cfe319537172148e67cde3376ea18674b0734. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/CAWHO2010489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02cc9ceae576cbc0d8a787481dddd93f66ba3af9109852f09417c52b83a9af0. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/CAWHO2010490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11430088595523201fd2e6418800a0cfb2f51a903e1ca622ca78b355a3c004df. Chain 2 (Bitcoin): anchored in block 958556 (2026-07-18T13:21:06Z), 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/CAWHO2010497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bf2186bc23fd40daff24c827b55dcd2226bb338cbd701c7db4b715de971781. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/CARHN2100915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f75823f5f84d6f8619e073e9447b16930857231dbf8d8115ef0dd58b46b446. 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/CARHN2100916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6761e3e8ca5a1132ba4b18069823a23b5dbba960a8b3691a273e7fd2a625302. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/CARHN2100917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10796f91fefa4ffa5e0b68f79fb9f0f70c2f7d0622e6648e7c018e0c9c28284. 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/CARHN2100918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399f0768584c0a94de33220d3503461267e427ff1f5565043686ece72760dd83. 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/CARHN2100919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd756919eeec895f20c7dce310627e9676ad0e5f26bb97dd7faa59e35bcfa619a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CARHN2100920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb631ec5a3dacdf6648e6ff0eb440f240fd1944af1a0c16ef340f4cf39d8d6802. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/CARHN2100921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa7f5690b727cb8a54cc97b2a729b72be80981767a19f83f4391dbd9d9e77c7. 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/CARHN2100922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78878468b65cbfbd17cdfed0923d2cdf0587111f81aad04f6cec38b8f3ec46a4. 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/CARHN2100923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29afb9fa26b8588393299db56b93fa92caa2c9e86cdc5040894dc83eb1dc64f. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/CARHN2100924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf251aa6ad4e3ba286acb68b296bbc8dd28dabb612f094353e07763aaea399b44. 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/CARHN2100928.