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 0x38ab7e8fc68a08d1ff806a58db3d372f3cdb1187323690cd8e257394d39a752b. 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/39668c88-6aa4-47ec-afcf-f147acdb346a.json and https://artists.proofprofile.net/proofs/artist/39668c88-6aa4-47ec-afcf-f147acdb346a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Never Know (Prod. Vangdale) - Bonus Track
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 0xd8f7ca81512c33019e9067fc7226e7745dd779d46f1ff00a4ab1ae4b9c1a20f2. 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/KRF151800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a67c66368c30aa370ad177309bb33fe17280505efdf3883ae4a8aba799a60f. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/USUYG1419394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972e860678ef5c755ef4d2f894c65f7043f39962e8d6140b0c91cb03604f7b54. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMER2147127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d311a0ac15241ce4e1dee710081752e67130683bd94eb03726c8446a4528ee3. 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/QZNJW2387998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075a0876175b3faec9fe3403db8f017506d96fca0948f89499a845d944c7c05e. 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/USYBL2102228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe534b6c13b2e49e3395ffe34b9a80ec1385b4dee0779fd05bed1f3f53b7cb4e4. 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/QZLBC2200526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cba2944ccabef7d8449e4465e801d4a72246c45df4414728ec06da07d809118. 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/USWB11800328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1295d3e184e46e0dfdf2fb6846784e37b19052ffd6afa256c78eb3cc135fa86. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USA2P2147846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819bd64b9464f73115a2b6c79f599f8c11717daa4147dc348dc2c8e39bf4b2e5. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USDXS2301737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a50b7c804ab3267a31211220aa599979c3f54a17b8499ee6e09dd86864ef06. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USDXS2203226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea25a0b8919ae56740423abfcf9dea6bb8f72e8fa7421dae0e8dc3e1835db7c. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/USDXS2203706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce04ff158eaa122820bed2e9a2b4a544bed0243928b30308be33d3dabd0c77b1. 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/USDXS2203229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b6894fc052a4682d1354d2c5586740a4b4f8f2b81268fa32f4ace0d5d98d87. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USDXS2203219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdbffa040338e80dd4f95e45ec988894872661f80b161cc17b2f4a3256f1c04. 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/USDXS2203221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a50b7c804ab3267a31211220aa599979c3f54a17b8499ee6e09dd86864ef06. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/USDXS2203226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade7b831c52baab03e18fee60abdb3ef54886d9c2fef4d6458ba8eb9032d27e7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USDXS2203701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e928aaa69ab936b8d5e5e7c90744fb19a84b867e06905cd2b1bf27005abc323. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/USDXS2203230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11ef71b314babe7f27b17d45b0eff877e355b3c7e51ba5daf4cb169c4dd9743. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USDXS2203232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc68f604212d3a70fc717abffee165147271a147c5fd49cf5db5928983c7778. 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/USDXS2203704.