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 0xaf084f89bd413ca97f9813880b1aaf7db5459e586e360be83481d28aa6aafbce. 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/4e8d3547-4e67-48b9-ba5a-d035d872dc39.json and https://artists.proofprofile.net/proofs/artist/4e8d3547-4e67-48b9-ba5a-d035d872dc39.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 0x479f175859f9ad0d8f676eca86aaced64ed6f45f8af377ea678d18f1a0d80f92. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMZ92347958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf8d5f86b20947e04e9e10f6c2dd48eac558f191bbe4159a503d6a3deb37606. 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/GBRKQ2571457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc327b555e06b59405b2a44b4c362cebc2d123486e449a01fc407289780b898f5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2565239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e639d5fabbb3f548c7e129b1c72ec101d3048382b077d4c85be504ea829a89d. 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/QZZ8B2421958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7c78fdea22b75d1b888a355eb14943562042e79be300cd0b7554507e739a3b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJY2417559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e30c2f47921c3f59ce9b8f15ea4933a95547bad479e25f0b2f914c794f65d85. 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/QZNJW2435655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ef5a4693a4b67ef5c20c4f82f46020ae0946d42712281fab2c4b778ab9d081. 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/QZNJV2409260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac60d38aac4a097db3a79e4d2bbeac268256680c75ade5dcd4e08bfc8e4a4462. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZW9L2309127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb12d5cc919e46d27ec6e18402c7552c65db1c1ff0fb99ebf928d14a3bfa6996. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTVM2376141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e22c026b8913011e69bdb7dbda0247902e5095028eff0b00206c7d019bcee1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDQH2359170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd52f8748329f49d8a80eead2a00f3c6113470bb48fef00f2e06bd18ef5fe87. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2521026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5a06c67df21423fc8656e623ce64c0d2069cc3503b3560d3a11bd19c3bad75. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWV32477723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8770f0501d4c40cae03fba87f74f8b3d5cce1215b2e554c49d66e23ac3486ae. 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/QZ5FN2521033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd454e5e35910dadecbbc83f491592de3127fbb550eb0ab0176f311dc38e0ff7d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZ5FN2521036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5580d026e18a55c71a737765c420b68adda9fcc0651c5b7ec0d70982a13d7a4f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ5FN2521041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1342d627fdee31026907bd08ea17d2420cea6045e68b3976d48e8b7f98ea6c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2521050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71f9ebfe6b2eac6040af89fd117509208de6c7d779232eada33baa194655ca6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2521054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d619b36e0eb5d3c083cfb7dd7c1ce5aef91e979fa69b80870601744afb6d7cb. 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/QZ5FN2521055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4605db1d46d8fb0d9ddd4ba609705b21ecb14b1b437312a1e5d32afa18cf0600. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2521056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad13f58632eca8b315ffa84f58422f74ef7137917a7a98199d1696c449353b0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2521061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d578712214a2bbeafea53a7b9a9ec570c2daa848dd5849fa43749cc34c2ab4. 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/QZ5FN2521065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74467cb03fa88eaa6bac9028e104cec200bac9b1679bb4a249c1b87d1d8286e0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZ5FN2521075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31a6f6fabf042bca5f1cf7e70b6883dad94ea5301b5ddc316ac26e1be67b7db. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2521080.