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 0x8b1038ea887e595f3a053a7bf18dbf4f8f09ad39d6fc34ab340c4ec3b3ff18fd. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fc031d7-27f9-4af0-b13e-8191adc671eb.json and https://artists.proofprofile.net/proofs/artist/8fc031d7-27f9-4af0-b13e-8191adc671eb.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 0x1eb2af1fb236106ee60b8efe0a0ff41318a8d2b1d2399e6f015d56ae7531cb36. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/DEAR42457825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b49d79329479be07e71a5779634260427ac2981f777c63101111f21a0626b4. 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/QMSL32400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc003cf6373399f8caf51f0cded5355f8217dbed7079e76172fa2321dcbc2c6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLCK42407617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7af3cb9b60d1b7af979f0a795f5bf3bc30ff56bb99e2d99e793c86f8b9c099. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/NLCK42407624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b67e78cae6071dce3a70eb0aca12efb310960a32c9eb9fceb60f9d7ef664db. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/NLCK42407628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfd84230164f4972b1125f8b425ac75d05f056bbf922dc01819aaa470171f78. 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/NLCK42407629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47d74be5a9c2888f8b5fe6c2670f52964e64673ba9d124c7e92a7dd00b0ebba. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLCK42407633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1870686031c229647462e8e2519f30319cd8798d94b51d738abd0c763745ae30. 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/NLCK42407636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a715361509d879ff0b998b29a37cd8090fbbff920858f06abc3c4d4d6002fa. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLCK42407645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e27c825e2f38e9da181f17a7faca5127bd0d329c71c3ccbe2e4389d168c4b8c. 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/NLCK42416066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058827b7cd236f1723f7ab236a812d6dd13b1d2424c4722b182f318d3e415def. 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/NLCK42416067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ebc2ad88984df8f3297a4f13803182b55ad537c1a4a028e7e4b6f6be4f0af9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLCK42416074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ad52ac2770d2fcb5522b9842892bb4a1bbe23c5bea298954be13ccf0d0af1e. 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/NLCK42416081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23418b1bc5075ee47c2a71bc827165b3f9e3f748a2528f62922b5bb14b8b567. 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/NLCK42401526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144cd502374bed726e88b9a86456b41b409243c0f3e3c10d5940d409f8b88624. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/GBKQU2447391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463bf28e22a2ac058768148a217cd4b0177192947bb94e7a02a16ea5af5395b4. 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/NLCK42413643.