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 0x62afd8113f87838599e79b587bbad31459b7454f676271c37def8d8f18246de3. 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/316cfe9c-6179-4014-bf16-cb4a229b082f.json and https://artists.proofprofile.net/proofs/artist/316cfe9c-6179-4014-bf16-cb4a229b082f.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 0x7e3a4c1705391342feed8eb80c5e409d6108efa99f9357002bb47aa8a3e9cd41. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/USA2P1832702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8453b19ec268f37c211d704e5000e10620e91a364c0e19e34c3d1d7b58fbe8d. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/USA2P1832703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4b95078cdbf7eca4496ad675e51aeed52baf08f0537b6023dbc5c16a3c8e53. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/USA2P1832705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbb0b53e0dcd68c7697901da030ac9bedd32c274980925a01e2e19b4e24a71a. 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/USA2P1853764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47e95855411423374c34a77f08e3bae6c5784f95a5d811430f72e2038779c79. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USA2P1853765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76bd0583f1398cbf7c4837af3958726d3597a4a7131353973cf16841d6941cc3. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USA2P1853771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213e7fc9fe53d6087e7f84dba7828482db98dd1eb8b40f8b7a891343683272ab. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USA2P1917431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe001c9c434cf321ab5147b072c44e45fbb32eaef759167a4f1b8b510116a106e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA2P1917435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86cab87f4383e7744dd4e079e26a6f7f250354e891ee45cd4465fe7fb6dfe47b. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USA2P2514683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d4be43106675ef6df23d6cefc90775c36163724c44d6494c8bc550b5921b70. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/USA2P2514684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a484f08e61239d4e029d3867080715d8ad27a906d45cd954794066ddca3c8c8. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USA2P2514685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0b6683df04ed6bd8b6ef89161019467c5320d9bdccce06ca9f7ab4a1b79fff. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USA2P2514687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b662b66bc8c305f4f3def25196e8c3fd4770a471f8b8c0d346bae2df68dc19a. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USA2P2514688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf961c5f7d468b3c4b82f3e9ff5a823b6d205ffbcd73b7f7a1a68803be995a84a. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USA2P2514689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6853005fd00ed8e67fb603c343cd55b94185a3a6da33bfe815be6ffeda0769f0. 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/USA2P2514694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe620d1cb16809c3a1cd32477073b9851568686ff62f25b396b2a2f1ad3dab8f4. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/USA2P2514698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58c8bad37651d8effe62f6066b3e3165d0bd68ce096d409ca463c59549e362e. 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/USA2P2514699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a80dc69e6ce9405f746dfdcbdd71d0ece1ca489892ad3b680cc0d1001d1e63. 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/USA2P2514700.