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 0xcf5e2219277779d08e20b0090a905b138f5311f84ca448948a5059d4e04e30cb. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/83486189-22f7-4c4c-91a3-5bc50c451c03.json and https://artists.proofprofile.net/proofs/artist/83486189-22f7-4c4c-91a3-5bc50c451c03.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 0x240d826c2337a3911615e7d0194a89294e1b1193ea17585698e8d36c112b3cc6. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEH742413460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700bc4a33a73c2a5d12e552c4546ba2a2c7ae1b9ed4d42275f5278a9f15ef935. 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/CA5KR2454950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f0672f8c95d659b742ecde191d11b5abb403a2694b0e44e89483d68e633356. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/CA5KR2411327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0404611db060626e7d069fdea8fc7334788189c53a0e44e533d2aa69f473710b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA5KR2387923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa146e8e67d1b1eead4824c14af17a42dc4458c7130588b382d04a1f369cfa79. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA5KR2351263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbd2d6c03da3497652dd078291038a7019d790b76441165d86ff07a2b1bc745. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA5KR2351265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04343ddb83fda70360491b699f095ad54fb6216abac1ab96093d0daabf4b3115. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CA5KR2329897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c456a92a49725cd393ba461429871d4db3128e7b98a7956bd30e3ddecca62e. 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/UKR6V2291269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594c3aae6ddb746ba795c62d609b2300c79bca75fcc942f0f9c54e121b0df812. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEH742327559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40539010e87a1e0dc80933fed76ec055eb165cf62bbd022329d659573fedab35. 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/DEH742327562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa020b49c7d1de817008c7e81932c9cae357d83831224f3c2d7a0154d21939c6e. 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/DEH742327566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6891e0d17406f10f8b8d15c43bab3bc1cfccddc0d74a66a83a60f7d836183041. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/DEH742321957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6c415eeb80101f69857ed800d9d5bb7e8c26546d36c952fb0b2a3ebf7e19d3. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/DEH742321959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a084eb989f5cc129995cb65368843b22a29ebfe7e5cc074513c38e9b40a9a5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEH742302812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a5cd62773f7fa1e316817df74a40c0ddabe11be7f941d06c8697cef6ef4c64. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEH742302821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f9fdaabd47fccd3d5afddc3313f82627874ff4ca9b52c5ca9b125737d81159. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CA5KR2403988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819676fcb36d86579ed88dddd01df6d9c3409996023eae16b5bb97dbc7e0f8e9. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CA5KR2404004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150fec20c2dea02f11f25e8c0ca5477ac86f988f52eb89c40b1c51bd5048905e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU2360701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388a5993c82e73fe7b522b7d4ea4a3345144c4c0904f83251ef540629a19d953. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CA5KR2375501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f88c395a624b821e2ac7809e34accae5101db47d24dadc324c953f2ac501c7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CA5KR2321632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b92ef6e358e4a153bae9b9eb85c1d3e09649ace0ad860a9446d654c55ea7cdd. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/US83Z2555238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9cdefdb63d6711dee86c17129b64d3a545eacff4490e15652c5866ab17c893. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU2593304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba84501e162947befcefdc95bb7410c314ba8e35afbaf41301dec1b0fcb7895. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/GBKQU2593305.