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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1b72b136a8796986d8bb6aa85bd8b7c3d31152184fc9b597e0cf3be4420f91. 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/0886a5bc-5dfd-4736-b074-2ba3ce01cdf1.json and https://artists.proofprofile.net/proofs/artist/0886a5bc-5dfd-4736-b074-2ba3ce01cdf1.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b315df6cd755e77ba3334c21af91f8884f04d212bac4653c14557eae6d294f. 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/QZNWQ2433303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce55224b9839be4f8ba95c6b5b6b955503333ad38e25376d54ee475fb8465358. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZNWR2413789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906e354d2ed8a7743fba00ce8daa69f10fa9735080cd749c813bd03b8ae9d6e5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZK6J2403309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c72ad97d4935a29275eedb471b988de1f3fc13f429eaee0e3e0b1bda089f54f. 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/QZHNA2449636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c46965f83db2fa5f82923b21b44fbde74057a4ab049716b6802f2c615d8fb25. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZK6J2382844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31d836ed0b4fa604dbc908476051d2995656890a77494be19c9f3c9524593a2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZES82335077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bb604a71e9a0cd3a080e26dca6a0da68b9acca094579ef4fa27b639a8ad6fb. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZTAU2247574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76db22a8ea608fd930d552085d7749dbae1faf2de2145288f69328efcbe149e8. 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/QZMEM2299133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c7ddcfab429dba9df24797e51bba0c989c87346ae86d81d84c80cee6cf2c18. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNWT2129391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45612b49b783dec278e1a4538b28a8969691d2ec1f265f3284b4f4b4ff51074. 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/QZNWS2147392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877b22f707983018681dba24b517b1a8e6cb83e0c6acd90ce3623ba39e46bbdc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6L2107054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb07dc410c3e4c7dc97cc1fea950f35768fbbaf9227172fa039c502325aac4f3. 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/QZHN62145881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a1b943ba0723289c5bc0dfcd44a2da0e70ec160a159db502576552ae5a0929. 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/QZES62129534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92799b4f7d867a2d1e9688967ad09cc32611cb54344e179098a60243ac9c6c09. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZMEN2092330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ab90196c6b5d1770b6a669fce110d0f5f7c3dd15eef3078fb646acb765768c. 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/QZHN72088653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f09187deba0f0e90cca0c1fd1ecb65bfe03d28cb955b2fd86aedbdd0efe9673. 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/QZES92094064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fce199d155b9c2898d1db423f01dac443504a299b5a0900f20c4fdc60c94be. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZES92093420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00dc4eb32c27ba264656e7ad5f79532f3b4ab4755ea59dd1860e8faba25dcdc3. 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/QZDA72090666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa908b5c919e160d124ab99af5ee2c016d9da213c24c2b6131117ccfc6ee80d4b. 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/QZDA62042201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4327229d211ff49aa4794bc10905a32a2f9e2b2b3626d5adaf12cfaf2d0a11. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZFZ32046847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1df7ca4c15c6b18e1c1b48901523e1f2fb8b6000ef68073ea04900153a27007. 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/QZNWU2191183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edc69d6b8f234af69897b2820646b0578a8cc75f600df121d9b3519169e0fec. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZJRB1922956.
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