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 0xe0b2fc76fe9a5127a655fb4a205013a2a5e95b2bef1de16018c07b793fde5608. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/655a0b2d-2fd9-429a-a70d-667be1687e84.json and https://artists.proofprofile.net/proofs/artist/655a0b2d-2fd9-429a-a70d-667be1687e84.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 0xf45662c0f2072b30e147d7d777ba49770ad44a49d5e36da33f6e710200aa1fd3. 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/QZWFS2304848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9569c7952e8a7eacaa61cc1906c5455ebcf20cab9b8c1ee281995e58509284ec. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZHN92567588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09853404542678167dd1b6f17a43ffa98d95d58ab4c8cffb79cd304fc1becb2. 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/QZHNC2537667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc066d64b86786e7bdfbd38dd2be9befcf451db23de6c3b6f19e6ef85e4772dce. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6N2505020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3ff71d201bad2ea3fb8c96c43109c808f994b68e9b9818347c5202f014fa71. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:16:47Z), 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/QZK6L2581991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763dcd5abd53c5e0ee3ee5b582475145787c625bf2c7593c7fc656a1531d15ce. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6H2568828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cff174b11234b4cc111d202c12e968065e2909c6dc60616d57425555439cd6. 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/QZMEM2541510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71b3f22b4032cebc629ca9e864c07ced13dfd49cfd1c51f6f99ee81a0f2e062. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZMEQ2536551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1717d37a8cd01c5f3d1a98ac72a49a4135ae91b1b15033f08e38f47486eb9b24. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZRP52513632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18733ecfff3576a6d7559b5cc7938bc674687dfe86ec2f09193e6c44e092213. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTB32572489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d6c50d61c62a814baa262feebef33e1bbebb8a8f010b71b8312de9e5cae549. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZTB62581451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0672f1a46389d9f1c2ef83e221b8ba4fdf214fd41d2479889efdc489e21bf9f9. 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/QZTB92575694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71040ec02a956bc24560ed59beadb3aafd7d884293eb39f48aa661020882604. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTBD2511195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecede58535f4b6cc520dc1a685b338510129f69fdb1a9b75098ab50e30a0b15f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:49:04Z), 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/QT3EX2557268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7166e31557a5a320739ba77cf6f02770a31711500269698ea2c14180dc7f180a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QT3F32504956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02d064a60f02959aa3d55c1c2e6a3cfdf3d731634c35d810cff172a0a4b0fcd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT3F62577431.