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 0x5f23ad4a4760b6e8fb0337f229fa34009e96ac2fdbdd96d7b8678d5817fe8698. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92bff72a-f455-4f5e-82b4-6f283ceaca09.json and https://artists.proofprofile.net/proofs/artist/92bff72a-f455-4f5e-82b4-6f283ceaca09.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 0xf84f28f7e0f29d8c1be71f4f33e1037b58fc042524fdf36e18b00e3ea8d02b3f. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/QZWFN2337086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251f9436bf25cb6a0a5dc7f1cddf1461b00b2831e2c89b27465c89068f4463bc. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZWFS2316669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967258e0b46363aebe835f2a78cda264d2db5c790416db4d64e357b8bab37585. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZWFN2338952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84f28f7e0f29d8c1be71f4f33e1037b58fc042524fdf36e18b00e3ea8d02b3f. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZWFN2337086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e0578602b0d236ed7a79ce7489f23f1ae46684b8cb8e351fef36756089204f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFS2318496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54958480e82320c6498806907aea43f6f0098528fc0f0ad80118a0bee16c2422. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZWFS2318497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be6694d3f60557e07dd0f27c5a5f08a346cba546c0351b57542e5920e6a1f38. 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/QZDA52476332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07f51ee7aad4bbee7d4457796d475ead765cc980e0072ccc8d5a194f5517f0c. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/SE5752473101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f10fb9ab0dc4eb371f69eb5cff822ff81072b29da2d5c994d68b5a13ca8373f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZYFZ2415909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839f1f83608286b4540cc57ed6560ad00aec908cf200becde8fcfc7ce57e3bd4. 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/QZYFZ2442531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94497ae711af38170dd1542fc3301bcfe14ccdaec89690359b73ad9bb172cf38. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAZ2473025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9762aed84663209cd887f5951e3f87a55d1ef9dbf10be249c5ee45f6149f15. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZTB52409886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f5ebe58b65ac3bc91c7b75dcf0fbd796a273bf10af4ff5edd4cc3c1326d48c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZWFR2495452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336aa815d78e2366251b31d4ce3b7a8c74196d8812adb2d16b1bf7d27bbe9083. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZWFT2433553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c44b8087e0a18fe550390a04e28c90031454c22651400b8666e0df6690dd11d. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZZ7K2443964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe148abe7f3a640a3879c5adf342f5d10b232db2f3c88e8e621ed72b666baa76e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7Q2435245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c28af485e5d368a27019aa1f01e4c2f9575145e3a79df3b3a4a429f374cb74f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7Q2436654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8325fffe75c35a7f44d4fd84edce76e0c4e3b762bf777d7d45be88d76ec118c9. 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/QT3EY2451076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cd70448f9d696522526f4fa151815126e2f995d1d7b0f32eb22553cbb4101b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEM2553973.