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 0x1c5d15af0eb185ff2a8046f2c3eadc32186dc43d7e276ad2fd074c36211d8e47. 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/8905d8ea-922d-4f6c-a3da-6ca87c35b097.json and https://artists.proofprofile.net/proofs/artist/8905d8ea-922d-4f6c-a3da-6ca87c35b097.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 0xbbf47ac14cf42bbbb6fc41dbbac2b341a2b9ac907ea9395a1c1128a04a938f14. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TWU712305839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12af3d12e8b4bdb6468bb297b5ebec08db60fcdab335b4a4d8f9046c1b7add3c. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/TWU712305836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ef04ad2f6b5393340cc108dbde1f371501b470bcc4cdc5122c563eafa20d77. 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/TWU712305834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0b2a98f455109891243713aff6f73c67f888f37c5999bcbaa31aeb52025bf3. 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/TWU712305833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e2a595ff4fadb029248d400b62459f442fbe393f3ed1e0823b00d11a2d7ce4. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TWU712305838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7db648ed74b3f245bc9a9ed71d720026285f5e45bcaf37e151e4d64339bfe0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWU712305835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534d87a632c15cdc2c3379773a80a37a2589ca0a86a429a215e0e344f436d0bb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TWU712305837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85846c59defbd2fa69139f3118d5a6521599f5e757e7b184220c19deddca3fbb. 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/TWU712305832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a6841602d417dade354490c392ae0e9ed4e5de2a1d397320d8c022a7bb3acd. 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/HKG732305605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dee3ce43379fdd54973af87f8559197fbf82c54ba8ee759addf4e0caa604fa6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CNZ502200800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4883a8754be3d36ee0ae5a6ffb8bd8bbd602cc5635fc2fa77140ca5ae00e5e10. 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/CNZ502200801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d23c09153edbbdc49e8757eed0920e43338ffc6dc5ba82364deefcf574c9e3. 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/TWU712105127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfea351dc813819ea905fef580848d4c1b4de0b164c92cd53f662b3ea2cbebf. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/TWU712105128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56a70749d1ffa4ddb821163c272f8f429783e8e9de5df34d4585e3a45270c8a. 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/TWU712105129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c1c829c048f618317b46d7d2778876e4c18448ae4a047c8b6bbfc7a355d4fe. 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/TWU712105130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f0abb73a2b27d9e1368c3880cb176daad865fd219eb9037b958dff393118ce. 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/TWU712105131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d30613e1655b392e7bffb5c922536f122874293fd6e9ee6629a6ada58db847. 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/HKE022212115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37927a7924433a674a4cf202c2772ea5e7b87da7360a044bb5ab6d0c33c2749d. 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/HKE022212116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19235f60f9b24c38fa8fe9d7858c866a0ce05979dd9f7607fd5fa6943f875f8e. 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/CNZ502000568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7dccfad3ccf8926872b423ec745909bc13a4f92551f4514b60623766226500f. 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/CNZ502000556.