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 0x8d4e4a5dc482cb220983902a0bea32ad6ebb08d2ea155fbfca97daafe8162d3d. 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/0deaacda-e1ae-4536-8b6e-995b1a251f76.json and https://artists.proofprofile.net/proofs/artist/0deaacda-e1ae-4536-8b6e-995b1a251f76.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 0x4cb849d2e292f72032a3637cfeb7a1429b3555ba26c9ccd8ec9bdb470e0d6741. 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/USA2P2415565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0e882a03a3dac45ea66515f0ca047490b7b55675eca605ce38f696d0f95ed6. 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/US43C1631417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3ad969b5f29bb923df25f0741cf94c90e3b31b7daad6a8394637fc5fc2a1ef. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/US43C1631416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf835dcf2e5b5711bfef730958950d216354a37e9f37a675daafbdc53100c06. 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/US43C1630904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c4888416c45db600c4a62d2a96cb18ecb4c7adb476f5de735849a308f8d67a. 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/US43C1630498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94aec533d758d99529d6a61140ede73a12cf78bb5291d9ef4a5eb2638c9a7c46. 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/US43C1628261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33af50cbc27199a39d2f6691e5b520189d43b3d6bf6aef619b35fdf8f7533cfd. 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/US43C1628264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b122288bb70da75d2664fb56ba5e4f69e895e2913522cebbd279fa085a3ec5. 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/US43C1628267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362e1ec6ac4ba31dc2700047eacba9b452b0674b64e735f9cb8dfd2b5ebacc5d. 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/US43C1627795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6099a69223ec42e6d7d4a32b443b6ff0769600af0068bb7f658239fc457db795. 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/US43C1626088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a1d92a984207637936eb0815743687894f45f65f85d09fe6ee2700ece1518b. 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/US43C1619580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb261208f714cf795e9dc0d1b3c50cc976ce13fb8ed7e809db16561e3821d408f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/US43C1619559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47883ca62e59cc72583617830100a3b8d71e29f257d23518bb966610ad776fa. 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/US43C1619577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2395f92a0527ac9d77403b5a8a9b8477e0bb39467a1ebc211cde44d546656718. 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/US43C1619583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86435a8ffbf2633c6e46a26307d3bb2774eaf8d98f0029da472efd60c1d07c6f. 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/US43C1619586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744d5ebe00160dd999085f939ecd2ae75dbb38e211f972f341ea9d44a09d9397. 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/US43C1614762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9766a763f57be51ec49501c518d24db76780db35f0f3293c03e48ffa20978e8b. 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/US43C1611989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd077f887c777f26439b7aa4e8f88a4461ed1dfca3083fe4ce34cdab1c57d3b97. 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/US43C1611992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f8f999ffc52824bccfe38add3f98d0e21f8be27eec9584862e6fb644fa030e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US43C1611985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7818cc0cd37b6bed9a4ca29fee710adc775cb5a9a03e1a939b2968729af78983. 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/US43C1611979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32656a24d36a9deba9598597ad27568d7251452f3637dac7d1764c3e28394bf5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US43C1611982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcde095e0e23125e86b9eda8b1b97574a434cf9148ec2f3750d6f4bae7ecc9f9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US43C1604844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3518a4bf7e4651ea739871765df6b4fe16ccca9815003ef08b17c14b64d9488. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US43C1604845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26ecd682303fd19eb41298fb47159db1a754db306f9f028e70fead288682609. 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/US43C1604846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85533b5124db06f5297a913140f255f73d44aa8149e1b29c5c583271717b545. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US43C1604847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85983a52390aed4a36c498fe93cdeb81827fd46488138eab407036a5e432b60. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US43C1604848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa71c3664ba548cd2589c49b64ceddfc34ccba0698af633b98ead119684d150c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US43C1604849.