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 0x6b2af781379fd92f5c0888973ef1b16899dd6dcac899466d41bfb533050536a2. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dcd2173f-36f9-4f98-b619-c9dd715dcc36.json and https://artists.proofprofile.net/proofs/artist/dcd2173f-36f9-4f98-b619-c9dd715dcc36.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 0xbf52bcfbc735b346ff30c26352e9e827fe15814ff913c616ae36dda0fdcd4c6a. 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/GXD7G2204840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea5ee9a8cf3494b77b80f9e94092e625f0d4e31703787e3ab16d65b7cf8c0cd. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAIR2469521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9b1f4a895478b103571388de5d8935878fa1964020dd2d2a98d780e5addf2f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAIR2467690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d333aa9f9a1bcbc33c959927cc61885f81485f523b718dbc2c59f6bef615b6d. 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/TCAIQ2412566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa744fefb0ca735f503c0e8dc131eb285eea2f899fdb39bdc9e7695378f43bdf7. 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/TCAIR2467280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d136b6f8a7b21c6ee63880b4c84c03d737ab56d3ce3c4c4b1700a8b92ca98a. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/GXD7G2284023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe59a23e6730854bbbf9197095ea23f3e05ac4d53fcc1e0c231c76cc524fa8a. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/AEA3A2215935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1ccfc5807e869bde18b9b18cf27f5d5ac18c385dc666293ba0d96b0883e4e5. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/SGB502590170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3735200ae1c4a416e3e15287cdb0d03d8b0dc68cc6b358748b0696c91856559. 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/SGB502560345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566d8145cef7b52e0afc491e657285111b9237d8a7027a8d7af20286e8a254db. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/GXD7V2543507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdff214fe3961c2d3f9216ee6847ebca1e98856fccd8dd7afde74e760a7f927b. 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/GXD7V2519876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80e5d62d56cca62d42f17bd5cee267fa1f13631b512c8df12d3b6b10ffbadd5. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/GXD7G2581197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce7dd263ed8d5f65c075a7727631a99326b6743412376beeabf211e485eeefa. 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/GXD7G2536078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2885abd034f7a569b6811a45c97b5cc84fc7f31a8fee59b4f8619b17add585a. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/AEA3A2541381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029f9c8c0f1ec5e8eb113f7404c6570872e8787b95913e2367d4a4f5573fc5b1. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/GXF972533976.