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 0x78dc1b59055f661d3e28ecaf7a8bd97311d4350c4f06b3c6852e342e87f72041. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb9a2aa1-2d04-40c0-b3b5-6f5da6cceba5.json and https://artists.proofprofile.net/proofs/artist/cb9a2aa1-2d04-40c0-b3b5-6f5da6cceba5.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 0x3775319a3f05a25426a5857b0d25cb01ebc12c02cd8f7b30d80f92beacee882f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GX53U2457290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4501f2e41db8eb5ea997249e55fe57a9e38f562d77e6bedfdea405acfa3e1bfd. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/GX53U2457291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833b83239f20dec85041ebd0f807d36615fc27b1bae4a1b3ef3a2d6d7e759afe. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/GX53U2457292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf79853dea2251591f1eb89216ef5d5eaa7e0fe466e47ce5e8eff9c1fff88257. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GX53U2457293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc8c547c405abe77bc22de9d9df1c1b69e148cbf77d9ea5935b7613437ce7db. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/GX53U2457294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a54e1dd641eda6a255e529d0e199e4dc5a7675b16e3de9869e051428ad20cae. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/GX53U2457295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79986154342f7456fb90dce0137a39dfddba8e7c665a6f8797974d80f4a4d8d7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GX53U2457296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde910b4862ee86924663b5492c728bf38ac73b1d5a77b01e918735bcf1974fa6. 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/GX53U2457297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625b5930859c3865734b200831df4316025576db6fe7913bfbbd8ea20a65954e. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/GX53U2457298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea11e4689581182e78a910aa43c763b1577ed4942d96e664f34f2556ef7b0a8c. 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/GX53U2457299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23d1e07e8838658c95be2415958ba0ba381572524d4488c4c2d2140039ed397. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GX53U2457300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afe7e2160088278d209a6959cd2a05ad3ba99c68292c0f6401cdcbc6cd741c1. 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/GX53U2457301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8009b28bdb81f1d1c66701c9a9cd3573028873ed4109952339a0c5d09cc3716d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GX53U2457302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810326da5b282fc7ccf3310e51ffdc2c965bde1f7ebbd6135f44283724f10716. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/GX53U2457303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6880f2f48614f5e02214c474172dfc381ed670b7b21305f8435c367eedc605. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GX53U2499873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84e6d00dc8fa557d6d46fe640ba89221843808da641359347e8e9bbe96f6427. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GXF9Q2400942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4485689b7f363b503659bf56c68f09692b4faa4e868f445648b263a37e529035. 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/GXF9Q2400924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f3c1f068d7900b884b20043f29defb4a2144c1942701af59001a71c9ea3f29. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GXF9Q2400923.