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 0x4d06933740965eaee0f105b90f9914313ac7dcbdfcaa2894211d3dcff0e9df49. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f51c2c83-840f-44f8-8d6d-434e8d6c36f0.json and https://artists.proofprofile.net/proofs/artist/f51c2c83-840f-44f8-8d6d-434e8d6c36f0.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 0x9cd3c9d3d7a07a3449bd3d4950f87ef892416e077250ccdc43b342668d42a6ec. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USHM21983842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7d5775c5915e727f69731c2b4a9c5af5333f686fb40b1fa54813463574a849. 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/USL4Q1953752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b6139d81d4f918ce251586f538d2a9166da63bb49d9221dba5efd984c8130b. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USL4Q1953754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fd00cb69d3c49be43d3fb0b60a6158db3b10fbc4c0d55185dbd4da0b960291. 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/USL4Q1953755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c45ecc1a1eb70e374e3500db49de16cc3067c518f7388e0397a073664cb7c3. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USL4Q1953756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395c598179f0c35d190314e0d1d5f8415f4115067de60c01c5723c20bac89a6c. Chain 2 (Bitcoin): anchored in block 957720 (2026-07-12T15:26:09Z), 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/USCGH2273362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9ee40f4816792c082d242d2d63653878469274205c767b5bdb176217a8e772. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USHM82445587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb79b14526467e180c661f440af2004726fe79a4679b750c2ac0e4ea84446b9f. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/USCGJ2550713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dead836c9b465fbbe42cf5d7616e7a985ddc9c0f88295e0ce553ac045d643a1. 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/USDY42285245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395c598179f0c35d190314e0d1d5f8415f4115067de60c01c5723c20bac89a6c. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/USCGH2273362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29425615eb3176a980c7d67aa178a876c6a4eeedd67bf61019b2e8b33bdc9ac. 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/USDY42285246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ed7bd649277d933f5c63a70d4c63b269089bcb4a22ece8b3813ba0fd2615e3. 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/USDY42285247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9ee40f4816792c082d242d2d63653878469274205c767b5bdb176217a8e772. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USHM82445587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7566b42b84f5487abf82877d759450211c869f1d71ddec9e5cde28f42c034d2. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USCGJ2572948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b9b0d06870483028447fd26c4c00dc5d266e8408bd77db7a6fa2b26646c984. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USCGJ2572949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb79b14526467e180c661f440af2004726fe79a4679b750c2ac0e4ea84446b9f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USCGJ2550713.