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 0x8957a789b9498080905f47bf8c3bf082ae075242331b0a110b3876d484f6304e. 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/9b31bdba-9629-48d8-a670-5d4869604cae.json and https://artists.proofprofile.net/proofs/artist/9b31bdba-9629-48d8-a670-5d4869604cae.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 0x2769beee3fb3289ffcf5b1843d134903051a2418855014640c7cf2f57e93e62a. 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/QM6N22324994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61cbbc0a74f7b1caf320c6f383fa71701a3b9d3ce4a7217c38ba67487571cc3. 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/QM6N22324996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42fb97afa7a916e5ccaeea796d232a9a919ef3a0f5db1a4a40631e3c44a3697a. 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/QM6N22325003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde7ea5254a936a3c4a0ab5df53dbc01580722422d8d74c79b21594f1a893dbf. 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/QM6N22325010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32cc18efd7153b0e53d0fb20b9039c081d43280a6d0cede46f7cbfc3ac149fed. 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/QZK6P2449792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa7d3aa9a0150ce2c92c5dc9d2e95a6c5e7ded1c054cd7fdc961d720a6e4c00. 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/QZHNA2100876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6e5151897c86abbec8d9446ce749acbd864f8e1707dda7555615841fd2b8f1. 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/QZDA42115222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa471a00c21fc7ee5fda5ae7c383f3f8a42dfc948fedc35f5c82a2affc8e32f. 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/QZMER2062129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee297d988f67dd17274d9697e9c0e79e9c1e3c8c8ec6f19d3058a18c6bc2e83. 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/CAI371720967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1208d2dc6da417ed119c0efe3fad73d91b875ebcd512494a003e2afc777899. 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/CAI371720968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6bc00a2866c55e9233bf767e7cfd778b83b638219c8a70ee73eab0469c8880. 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/CAI371719591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6342728d6270efd665b79bbfbfa5c1bcded8242f8b427c22d1caeca240e0bbb5. 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/CAI371718953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242a1dd9a78f82d739bd7a794b48b4dddc4dd2b0b96baebdaed40dc4305a7a74. 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/CAI371718200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6344a83769629c29eb8e3b0274be30b47cbdd509995bc07844224781c0031718. 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/CAF7Z1500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0232821236606c68f916458810f84b76bc5c293a113d4f1171b6e2dcac5caad8. 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/CAI371717873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07fc18ac9b56a32c1294dd2055b8562e8748c03b60aeef2fd5617303b178071. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:04:51Z), 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/CAI371717874.