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 0x5fb4db1ee0e347de61a52536520a40401b4379680abc4699612a06b4fea90034. 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/7589ce9a-0690-4ccf-845f-0c61a583ac91.json and https://artists.proofprofile.net/proofs/artist/7589ce9a-0690-4ccf-845f-0c61a583ac91.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 0x6309fc2f51caf50493ed9941222a09f5f5d5f9e1fc9b0641f72a8011b993b01c. 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/QM6MZ2274775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02001f4a98a499ed4b4114a65c343303876093914f5c6997d041da8cb46c4b5. 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/QZQAY2109305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797a0b5848812a3d11e00350141b6abe6a49ab1589c9f644176b28af03c4edb2. 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/QZNJW2320462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81717d89592cc3f2f709b4db4b8176367d4eab0ce8aa8be23f9454aaef94fd5. 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/QZWDD2514485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd43e23dbab1526433d47d43e9131e562e018b45deb98a9d7553d013cb33984. 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/CH7812536288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5b82b6c596e934f734abef2789719cfc802e08e0b36657b98d76ebd63a4059. 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/QZTLA2586812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad4e10f77fa120b998faae479ab716ba3a97e751f1390d92262f97bf597b5fb. 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/ESA012568870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24d62b7c25f94a0f60bd5aae25e57840fc556c5d195859afb9c7fef42a34e51. 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/QZTRX2568841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2b9a74d0c268c7ea8589b6c41d2710170de7358cf5c8b0e706cc5a1d10250b. 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/GBWUL2572660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9090eeecbb7b4824619901e77747d806f421e8f2763e895ed051d88c94c77308. 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/GBRKQ2573971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87968e4047bdb5da21ea6dc07866b471263bc14f858370e239b854077c588999. 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/QZQAY2506460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29efbe7e8f33a9c8262f1d005c317a6050b4ff9705dbb86961e5739b03db004f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:04:52Z), 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/CH7819577540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301190f2f48b2665f172d9aafe1ad60d6ca7d0da224d95904e695dd50bafd239. 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/CH7819577466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9e6805ab3555bf9e019b45d718112c51a199781dbc42ec639457f3aaa9b9c7. 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/BK4DA2516670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980396955cbbd03f35caf1cce30abdc8bff81509873a6e2a1b1ff27e5427aa8a. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:02:23Z), 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/QZS7J2400988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cc4e036b703170d16c572c1d0a270dc45debbdf7dbaf38cd1070677be81819. 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/CH7819577262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80d43ec23aafd5e2bda4caf4155cbd2d344131e026fbb7c445a695f1fd8971b. 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/QZW9K2429629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720d58a85e01150fe4e27d436d2d7d83bb7384de624997dd0c48e485d074d11b. 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/CH7819573522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868920a90c1a0fdaad5cbf090a81e7b51f844d8a631bd69eb1f1a4bc48ffe1d9. 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/CH7819573521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3d494ce80a74cf17b5c02aa856ce23e06e64dcf69834110db72308bc963a5c. 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/CH7819503547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea88d5294708d9d9082d5317f3bc10baeb6dd6317c80eeb85324a24a55cf9be1. 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/CH7819502135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0731362021451678300e2a7a80397bb5ac86bff0b07806ab5bfab72f5bd3038. 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/QM4TW2408651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba89e1db4ed5ecb5abc2e5b50e2b6fcfad262cbb78e868a4fe16c11c9ba759ba. 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/US7VG2292226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208bb02553a7a513197991a2c09a2092f503587332668dc19c649d4976f21225. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ5FN2480879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42728ec72188ce610313c0b9869cf8a292758150e6c19688214ffc47c5644cf. 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/QM4TX2261584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cbdca39de2c049047f4b72e2322c23f083a87c0dc8e09257baff18e651af055. 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/QZWDD2244336.