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 0xfce889d84ad49593730ac7487405bb778fc4c7a24cce1d905324941c1d002622. 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/c20f55bb-1861-4fc2-b5db-e604a5c20a6c.json and https://artists.proofprofile.net/proofs/artist/c20f55bb-1861-4fc2-b5db-e604a5c20a6c.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 0xa8e02caea27578b2f618fddfa04d552ebd5951c1182493e3b413c93f0b22ad59. 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/ES5019998012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33e462ef1e6d5aca9fb5bceb277225f8546e854b3d27588f4aefb659dd70e72. 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/ES8000210701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447692edb20abea56b496a73b5f5b31e42e6166e4f9be4bdbf1cbea4a794bcee. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/ES8000210702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae150a930baddbd40a78f651556519a28604de32bf7badab86adea41e316983c. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:12:11Z), 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/USA561010864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb754b2e63f36d63ad98debb4cc5defbac4580090a16046cd2df9977e493b9f1b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USA561010866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5009003836e02bd7bc72b9a0022f8e5e39814e4ee8c4517959d849f8eef156e2. 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/USA561010868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4219cd7f7f958f34fbaee05f908a5f539dd198927a4ad3a1245a0b07d65fec88. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/ES6880802370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1e3033173ed19d3518e73be06fed7ad4d6583a22e268605eb43492fba39446. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/ES6880802374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2abb488ae0dceb9e16c112fba9d8d78a8396711c9a2ec46adbbf6bada26f509f. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/ES5151200187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d56ec434cf0b62e79447749bf5103175f92515c4205ea947315e6e1891a10e. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T15:25:28Z), 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/ES5151200190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0857ddf3f667a9d251d0e3d8a7072357ceb6762e11b2f19793accba4cf952bc. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:39:18Z), 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/ES71G1510686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953eba50a6e87f93e3a6952be10d932d7b73a1169d8d06da140fbaedfbd8e88c. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ES31E2401622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f2623a7d96ecb9afcc350fadebff718f2d20e9b4e7cf6a73b5e7e68c4c4735. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZ5FN1979225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b58ebcea94e8db2532df6c792f3f7860c37ef2d3f6bd46bf3918f92838b90f. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/ES71G2103225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69a1d2623cadac34930922cae01bc0dc406c4b45059481ab235f4ece8771302. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMBZ91354502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70636707b3e48338aca627e06b8b0f7a93d8e6b86fc1e93a465c59b3abe357b8. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/ES5152200024.
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