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 0x36cb73fb44cb560be268707448ef037de73a4460bbf4e8aa603b3c6e0d332fed. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/172fddf0-0012-480b-96f6-ddc59802dfdf.json and https://artists.proofprofile.net/proofs/artist/172fddf0-0012-480b-96f6-ddc59802dfdf.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 0x7dc39207cf2466d1e61eb474a8b50e917a1615048fadcaa2013119612d0d391e. 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/PLF391400164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81338a4e7e80cb71556404fb02cdfd37246c66b57e9432bb3c4dad64c6799186. 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/PLF391400165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb7c08810a3c2450a51c2ad27ff3e88feebda4f9fbf63112460b5cfafe95109. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/PLF391400166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453c90d8a04205fa1b2e0ddfb9930828ce8605baae1dbadf5b371bbb3f035bd4. 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/PLF391400167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8a9c61d0782499504086442989674c58390b97ed998a8571df323db3ea4583. 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/PLF391400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0469b56923fe1f51fa217b2a0ab4444da9e596cd3708e4400725bead86a756ed. 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/PLF391400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4deba3ee639c3f6dcaf228b1cc370c357cbfc17122e10934189e94433c9b414. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLF391400170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70082278d067cebe8224e94afc030a5bd61dc8a79e91de442a57f3567eac5731. 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/PLF391400171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf05100a17df733a4009867b75771f790908dd5882262fef013839b0ba77c2e. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/PLF391400172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe8e9f3b3f3434cd2cd018f149181e7b1b7cdf1abbe1225520f9f2f628e9616. 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/PLF391400173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d567056eee4f7f833c4bdc3427eb0adb20954414c475115f23eaa083e8dba3. 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/PLF391400174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9381de1bbd3bc73fbac9430833308986570d905efd0812812606492df9be3784. 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/PLF391400175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64b7b1f93c98309b6035e8e519e291f360a16ad5ab5dc9de29c1f889774e796. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/PLF391400176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a459ca11ee470b6d0a712bd38249ec1074c5704e3ded3e4d01eb79e9018a6b8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLF391400177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb725a2861f646f680f8495d7b82481fd69326809f586d3d98601a8f37fc8e8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/PLF391400178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c2cf2678e37caf445562ff83c742221014b4ed870f97e7ffe9daf435ef6073. 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/PLF391400179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e891e2579ba05158974208dc78f7f115e7996e6529694453f0e51b457d8e41. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/PLF391400180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcfb44ade8db7e2054538bb3cc6defbf4738ac09faf54fa30d303e9fc0c4087. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/PLF391400181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7cb7905454994984106b518eafe87a47c6367e84d01309358155333231bbfb. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/PLF391400182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4448ac81645587bc83ba1762055477d647714b3895c9ef473c06c85976a06f1. 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/TCACB1461056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6e669780f1f799daf98d80f30ddf722473a95e790846b11fcf1011a3c04dab. 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/TCACB1461059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b941c41afd5cf32a09c0fbc2f5aa12fc7f96f2afc405860fe9e9957cba7160. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCACB1461063.