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 0xfbeb0716aa0f22318f3cdd8a7da8c5685cd11309420a812a880cc34cd71194d6. 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/fb9c1cef-5202-4bdf-af1d-8642d5c41f2f.json and https://artists.proofprofile.net/proofs/artist/fb9c1cef-5202-4bdf-af1d-8642d5c41f2f.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 0xe9f2837d4c4e9bea6228f8ab774bc1ca71018e18fc2498d653515f74888d0581. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/HUA5Q2200082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1283bc53526b9927bd9f7a2c7b2fde002901f8acc508d98982e76fb769059bea. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HUA5Q2200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15eddb429a4f2ceccde74dac123e109f741e57e946fad05be0a5b9106dbaac10. 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/HUA5Q2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f7849668a44756208e4f31cefdd7b0fb968b759cc50ab1fa4d703ea9bfebfd. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HUA5Q2300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb40634dd699113b07e16bebd6ff7163ce650d5b30c47d2e7fe4bd0822be9c8. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/HUA5Q2300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d51d6bf591723cec5e0925075479adcf94edbd9847d575607696621369c4f37. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/HUA5Q2300052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359ccaf683494241984795b1b3fc712fbfb41022fb66d52aaebbaf709af45980. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/HUA5Q2300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af5b922aa01761768db53c8dd7220446c7ccb833a7d66ba573079919ee30e0b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/HUA5Q2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f38220ee5e40a58bf6159fcdf5082119a4350d29ae31e44ff24401f11c641c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/HUA5Q2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f26313b3d58a23584d9af32072c144a150561db6a454e837b1986d2a3f78bc8. 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/HUA5Q2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ade6902a8af876e156ccd1273b1b3ae9d0e0c5639e38393b7a72a9c1b10e9b0. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/HUA5Q2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866f2520ce1757613be9da149ec0d7e09199196de09494028ae286e0724e96c8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/HUA5Q2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb96d4d0277cc100b30062058b20a3700c561290c8fa0b78f7590e73a5461675. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/HUA5Q2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf979bd8a21f9096354989c90615810f204aee277d151d2658a3d4ada49de5ccd. 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/HUA5Q2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a1162c864e67539e0f731f655c36f5f690089889438285e620cd1280cadc05. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/HUA5Q2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9027fa4cd1a8c12e55d9e41ea798ebad27a7936896fd8574f4ba29e1b5ceae. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/HUA5Q2400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b5f471cbb0399fc8358c37a6088da547803835943aa5dd29785f9a2b2ba11c. 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/HUA5Q2400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95fb4666b4bc11f68021b2384690c5a9d8e95244db228ed09ab17fbf811690e8. 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/HUA5Q2600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18020742c223cf0db9d81f30802009ac91bff3f5864b9c4bfaf629f6e990597c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/HUA5Q2600134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2baaff51cb9ee0d3f278cb87193c062ace31624d6a533682ecf1dd815448297a. 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/HUA5Q2600138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0acdfc4a5e47a495f36aefe3dd74bf7a4a65fba1a5fdc224af1145603fb8388f. 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/HUA5Q2600141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2375558a9808ed94af33027b040ef1ec5d2c07d022ca802b9bbc9895b19227e9. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/HUA5Q2600172.