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 0x33e97063bee359a082c10396d5376b0c52f403a82dcd3ed1a5b46d94d9939610. 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/9fc29548-75ff-4381-bdf4-5f3a5103f696.json and https://artists.proofprofile.net/proofs/artist/9fc29548-75ff-4381-bdf4-5f3a5103f696.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 0x33393bcfadac39c6a62044bf7edd1809e5f178399afa4b122125d3e7fa8b24a7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2387188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a1cb4b730c1d6e453f71912d117afd6c3d6f9909b08d906fd750b7e0d05ecf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2387191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde4dc8f01edff40a747925425188f992e7779666e4c136c9f4cd9565e96bb4f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2363107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c4015a80b6bc2e3d61cb7cba393183d556785c5dd75d33252bdde8eacb7309. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CA5KR2363091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f23333861f56ef4079b591b179ce0a07e528850c07f12ab47840fad3848eb7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2488261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbefad86b9a05f8377f38c7f0464400feed8a3e2b109488f06d5fc8f27340734b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2488266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7664f00e1ea9056503061ff21898a9b11f08d671bacdc3cfeba53f4cf01adf03. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2476414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a6d0f9d317a51488da9c1c3389dcb3a4e1b8c7b88248e1439bd0c295fc1b38. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/CA5KR2476422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09fd96e08dec2e277222738a995752568620ff04f4bc40a050dd69c07baba66. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2472567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd732664427ddc06cdcd82326cde51336ef51d94bd2ddc94b6a66bba9de51fb7a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2446439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7e0aabb7dfca979098910cc58bb0828e5b1fc7e2c3873cd2a46322f66a3acb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2442910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7793290f97560e98836fb92814e00c29e4cba05f0c6c6a2f863cd7d31e03f02. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2442883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a48ab2382e6286d60a02754933b2e43ec730f5825e4724d68a6f3404b70c1d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2442884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce53548bd1c77e86cbee9795c4ab6a1900240dacf4c033126cffd1b4787a7a5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2442885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233dc601d6032b005917ecdda2ff3bf2b3c750cce3fde0c23a45e06db23d7761. 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/CA5KR2442868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7546e57ba936ca99a140e81345cc042fe6bfe381bccdfea7900d139035832b9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2442869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfd69d6d788476a0bca7cb3ad1de20892a55a72cfbe28f3c1ed5e70cc91b006. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2387167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00d91bff9e90aae048a6c5c113066ae472332d9bcf3e717db2f84d6fb709277. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR2402053.