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 0x2698ae7e4853f8d7582cbc41a877d3807e76b811ac585903053fef1915eeb448. Chain 2 (Bitcoin): anchored in block 953602 (2026-06-14T06:58:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f602328-ebcc-414a-be61-c65328322b6f.json and https://artists.proofprofile.net/proofs/artist/0f602328-ebcc-414a-be61-c65328322b6f.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 0xb47982ed487654f8035e1313343906f5ab373447526cf419316f6fdef511b137. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USA2B2055184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf86dfe7b1e1f299cf74ed63725f6c958a5e3dc13f873eead4cff873774843b. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/USA2B2055185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae00afef8ca5fa81df20d7f1db726650406fce5d93716309f6dd8d9718681d3. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/USA2B2055187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2a2715bcb9f2862e93b3b9a9d510a7f84fa8f97b3f00dc5fc2ee39fe603741. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USA2B2055188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75d60d660f627e3acbe66d092012b0b720b175aa9ac41d9f8db9edab1ada046. 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/USA2B2055191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c33b1cc1d639f002dd515d2f2b708124b33d0b65c127a50342bbbac1da1b29. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USA2B2055197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9acb0e06f6c92043f65d544101c030478f48931f4b40d9aab0a0ae14736477. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USA2B2401612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d75c69201af65de101961c8c99d752634069cc4399202d9bd2a5309ad6a001. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/USA2B2511788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072bfa7a72ca81912ff0caf4a8818f0f74a9b15d0ff82ca406d5a97a11277628. 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/USA2B2511789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee64a61f7bc853d3a6c096d8576e1145d4b9137beb16e3eca32fd6dc9d4f1684. 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/USA2B2511790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134f6d27f6c5a964e2b03b99d06c41c76fa2f39e53e625c100435e9a23d977d1. 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/USA2B2511791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dfbcd15340c7c5cca0c8fdefd06fb50c540c1bf5beba05e48f8aa7ec25270a0. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USA2B2511792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023b6fa4e01a6a25007bb6cae874c9da4ac2dffa80347e1ba2b207e450ffef8d. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/USA2B2511793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a3d8c19d0793be195f8933c4aa3483f998400e80791e9c5bcb2a8cf47f8fc3. 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/USA2B2511794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3313dad60712add3a44132db4f654298f15a4853859f5a0a931ceaa1601dbc2d. 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/USA2B2511795.