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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 0x90634da473667281e71bdb4c4a3b2c0876c64507cbab344f4722ea463ad00141. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f0e840d-706d-4240-8802-45a3deb8327b.json and https://artists.proofprofile.net/proofs/artist/3f0e840d-706d-4240-8802-45a3deb8327b.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 0xae0332071c818656bf2c37f4f8fe432f545c76cc41a4b1fbcad4be451cd8abdc. 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/JPG102200921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4e2eb77fe5a6109ae193c8cc56904f207840c949913d9a83d7e3786a24aabe. 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/JPG102200922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5649f193aaaae2f84d846d255ec9ce042168284605789a8d7760ec9757a33b4. 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/JPG102101199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0398023f5155fe59babf80ed5a1d671c0b23b7f3d3893250b19a611fb8b2e7c0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/JPG102200162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c6f0e0c510cea95914b774af9a1ccc1f2578c93f29ec80ed4e11ec9d3b4071. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/JPG102101589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20dc7fe199d0d87022039668de103fd04f0c3f1ee3cf7597a5c929b210decf0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/JPG102200923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc98e2a0beaf03d331cc7941376252905669b50fdf02ea2688d314bbd409201. 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/JPG102200924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c106dc4d082b02c3e2200325db4721cbd1077df2d1cf3fb25729016a8cb131f. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/JPG102200635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6ff2fb0a811373477e4ab1f1db868aa8e3a1389970535f12b892c71bd8f536. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/JPG102400776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1ba4197be7d560bdb046687ddee24076d6ce7cd0042d65ff0d16a1da169dc4. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/JPG102301102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc985c78266025e2184484fb090288b2fdc33ccd11b027320a60062496af2744b. 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/JPG102301103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189da63aa9186eafb3fdc22b099e04bdefc9d0028c4f45b3fe7cd8842eb37f97. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/JPG102300827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721006ecbb9676b88f5dfe64dada1c5cb3950bd96f0f96f57f2339c5c8cc1f82. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/JPG102300379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c106dc4d082b02c3e2200325db4721cbd1077df2d1cf3fb25729016a8cb131f. 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/JPG102200635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0398023f5155fe59babf80ed5a1d671c0b23b7f3d3893250b19a611fb8b2e7c0. 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/JPG102200162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c6f0e0c510cea95914b774af9a1ccc1f2578c93f29ec80ed4e11ec9d3b4071. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/JPG102101589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5649f193aaaae2f84d846d255ec9ce042168284605789a8d7760ec9757a33b4. 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/JPG102101199.