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 0x0b2ffaa7396c3c66e2c6435a974650a85c6f7a01a646f4848c820cbfbd29cb75. Chain 2 (Bitcoin): anchored in block 953706 (2026-06-14T23:14:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cb9b76a-3afa-44c3-b460-8474d9957958.json and https://artists.proofprofile.net/proofs/artist/7cb9b76a-3afa-44c3-b460-8474d9957958.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 0xf15e488224399f76cc83a25862d4b25a3608702c1a163c9d4efcc330d5e378d6. 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/FXQ732300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fcdc4abc183eb9f1aa13cd0eec7f33dfb1c4b207bed37b2e6a07d8bd83db49. 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/FXQ732300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1842e75b6b0662cc68886ed0bc44cb37389f6e14ed065ef5dff8656cb66b86. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FXQ732300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3aa935a077143995b6b743fe573475ed2dfd88d38624797535140756d0e031. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FXQ732300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd05429cc69b79568f95c06be15decf1b6c589904551940f86730ac511e5fd87. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FXQ732300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37888de4a6786b8e839a329c1e67c75e65df3e9274705659bd1f7696472abc0. 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/FXQ732300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652fb58707057b4e595aeb824dcc3f6e27456bb9ffc37824374d07a97d7c6e4e. 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/FXQ732300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2f0db0718e4c5de8080c8b9fa6790251f96e94990edaa539eb2d4370fad3d5. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/FR9W11901009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbaee909b92fd5a8d2c55d5790e50a416172c09ae6cc458945728f2d60b6c23. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W11901010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e17466bf4c049720f44f712ea79d188b37061f11712a1b7aa1b2733ec7da87. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FR9W11901011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba63b92b66d934a68b7f9358ba7109ea8f2da3ea02c6d5e9b731bff12c9c1692. 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/FR9W11901012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0e0337e87fbbc6ffc4f9d03ced49078d299ff2dac02055d6ba977fef51f2b9. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/FR9W11901013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf249f6e0919bfd4077236b43ba13d90c5343adf347e398a8c4957d143739ef31. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FR9W11901014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55b3a5724f9322f3b7248f4f5066b7f96e3e957e3b6632ce5b6ed29f360f689. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR9W11901015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15e488224399f76cc83a25862d4b25a3608702c1a163c9d4efcc330d5e378d6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FXQ732300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dcd7f6911ecc61454fef2d9f4f4b33719dfc170361f9f6de53a868af4e6a46f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CH6541908054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eddbf50c72d0df07739628f9905b8c2378f46674c19fd3897d274ece595ad06. 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/CH6541908055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd29cb4e8f3ac7cda6dc4af820770798bf60c20864d24ccb7c31a10ed9137e2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CH6541908056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f47946ee5df4219d08a0cad49cf9ae0bfd09a7159f6b7b1b39624d286049038. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/CH6541908057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff09e80cf7ad02beb05f6a2b0a5133d909da95c39ac1e5a2a840585b731eb98. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CH6541908058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a40d1e0d38bba1400ff33d77efa39610d0cc211b670c2a5e2215a856a389a6c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CH6541908059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97be5ffe866f269bcee1bc070730e3486a6832c58be6aed3ae71f7ee10857f7c. 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/CH6541908060.