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 0x4cacf1f2897b293dc9ce3ee28051ce7d625aba18ca47dd03ea053b005b3b3b90. 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/4d9732d3-0cec-4567-8b27-88584b52c1cb.json and https://artists.proofprofile.net/proofs/artist/4d9732d3-0cec-4567-8b27-88584b52c1cb.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 0xc217b52ecd6fecdda3fb42f78e37d73448d88a1e21ff92dca1182db4c3afad9a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM4TW2244756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c2ca4bdf1fbd8cbe144a582cc832ef23ccda20e7eab34435cd7a28b53e3249. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ8B2498024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74db6adc5e8be8ed0acdb3a7cd0ac0227857bde0c4a339b22e61c6a096311fb4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWDD2545564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c71dd4b10cbf1536d8afdb3e0cad9f1f0588d056cf6cbedfffcb297cef748b. 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/QZHCR2300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a80b92155795601be4d0e14129663c9fe38ea306d8edfefd2e237bfd90da28. 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/QZHCR2300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a86409293590241da283e1edb3dad8b31c0e319ae6247de1d5f18ae10a9dd8f. 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/CA5KR2220360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a86409293590241da283e1edb3dad8b31c0e319ae6247de1d5f18ae10a9dd8f. 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/CA5KR2220360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925115c51eb3c1231fbc79c004d4712ee2ea47f312ae5b3a73998c3414e32ad6. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZ5FN2119238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6cd259c673fd772f33a2baf9c98585aeb1834eebe481c77456bf3ff2145ef58. 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/QZ5FN2119259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e8d806f62fc74ed9a97f0d8c0983f1e3f86e3230de91441ecd1dafe9fa785f. 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/CA5KR2342625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1995c2e68b6775d34c44e3b91700cf8bf7a11abb529644a68c0e08d7a2fcb5. 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/NLRD52259238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76180533f54e3fe27d7b4f2ca91786dd8e329b13e4d99797b95250f69e77322. 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/QZTAT2193057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5986f8f4f2d99d0191cee3d9c0c389c8b3985de1b2faaa931ccf4ec49aa8c94d. 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/CA5KR2174702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170a75e106b70ef3afd6ad2d31c0e0a6ef54cb8c87a69d74c28ecedbcd7e4686. 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/QZHCR2100274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c351317c2bad710bb330eb0880ca8490c8aff698eeca80db47f6b90911b315e. 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/CA5KR2404276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ccc0244598351360678ab851c8ad051e60c23eb5b79e560c493615e1f5fe41. 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/GBKPL2162930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b4d14068aaa46d8d91d17e6abc514e3113ed12ae5dd48d017ceea26c7cd254. 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/GX4Y82200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c8ca7fc6f689d5a30b15a8b2d69a1065349e91dbdc5c6c747a00b252ac21a1. 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/GX4Y82200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb94f6529ef850d36fd700d3c314b1e178ecdd7759a7b90f8f1a85031c68382. 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/QZHCR2000129.