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 0x92193f3292fb7b70c109faf7b4dddfb672fd1ca193a1d563d73ed8b66561d97b. 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/05d7d420-4eaa-4ce0-aeee-4d03fedff7ca.json and https://artists.proofprofile.net/proofs/artist/05d7d420-4eaa-4ce0-aeee-4d03fedff7ca.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 0x1756f20ad820b3e9f77ab7c887577c6e70bd058146f868e2e9c95050222899f4. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TCAEG1952418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c2ebe4e9fb6b2d84ad75b1c0aaab2d33bb0e4b1a39a1527bbd83f55324e3ff. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAEG1904192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8401c1e8f2d93b08def86d3052da14901c0a7c6c427472ac5ef16fc0fa704f. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZNWX2015645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef185b1ee3edd8f90405b502a0221b8455292e6cef6d4602fb48a81d485e6f02. 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/QM6P42378997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965e7e1ed60784bdb1f7969a1664f6e3d987ed30a0aba76331e74b301bd54e43. 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/QM6P42378998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2532ec65d39c12a525c8e22bb6d5447eda65804787f23c3980f9915de1dabda6. 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/QM6P42379611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2e16746428bbda3559230b7396d58d7986fa395aa7ec0143f4ee67e68f4f77. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM6P42378999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeca95f7b81d8fc8942168c2a706bc36bcc91c8c77596a04d573c1abdcb6ee00. 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/QM6P42379000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6df7a8746d36690f62426d0ab313b0002e359e22fd2a3cc3b92948326c8c276. 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/TCAGL2201478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8e0d94cbcb6b15de6afd8e5bae10a383ff7306928dd68260c91a98206b6727. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QM6P42379004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a20bafd3b8d7f2e447ff596a56f5dcb04ad44435de1febcf052ab8821130947. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QM4TW2561888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5255985c76b8657638887ecf01491277c3adc724e80b4a7d760f618a4c6ae0. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NLAG62001007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38dec2b76bb6bfb09e12c88229f714405185b5a10b444bc3d6f5500d4a68a221. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLAG62001014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519796a5bf4d6e3e1e98ea84b447fac720326f49e2d61c909efe20bfe404bbca. 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/NLR1T1800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9945c2bcecdeb383505a401ff99f8c8968fb63943d99ee4c898a04f92a2cbbe4. 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/QZHNB2106073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4f751fd0beafe271accb0fb018d709a007bca4bc9ec40a8ca3c7ee28ba90dc. 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/QZHNB2106074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d64187998984952c811dc632feb583d69c909bc69161fa2401e70423c3b1b94. 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/NL5HJ2300296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2d026458ea55de3a71b10b738ff26f6fe1fbec1de72005a6a3146dfacef25f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NL5HJ2300331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e4b0e53bc4f43fe79dd039b34ea449e30ee43e4ccda316e485736ee1d86e9f. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLG661900333.