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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5400b46939052b553c59a0d6ed07d4d99ab0b8475ce16e0ec25c347b1f970e28. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/069a851f-5fb8-4c11-96bc-6b5f20a63cc3.json and https://artists.proofprofile.net/proofs/artist/069a851f-5fb8-4c11-96bc-6b5f20a63cc3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Maquetanderground (Mixtape Maquetas 2009 - 2012)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0cfa00a23431bedff484710be8ca8f0e6933017608150b56d3dab9ce0717fff. 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/TCAGE2255477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b12dff2c132b8e4286f6b7e80bc3812a82b7a06d35a37eb5fe2331671cd1bb. 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/TCAGE2255548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40dbd275ca03f2e02b71a9b7a4ca5a67157eb892d8041b0c043d5d473fb5675. 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/TCAGE2255552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691e5d88e1a377cbdf6caa2710d29a37e731526e49b1448bed65c3fa123f14d0. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/TCAGE2270383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150739d2500efbd45d948f7359ca9946bdf72b2d00c6ba67cb1455549d1c277c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAGE2271045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bef1f8663ea286dd3c0563bf02f77bb961e921d91fdd0f3cae4caff499b9a7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAGE2271076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b82fc64beeb56c32130a3dfdc3d7ca19552cfacaa25e333a2efe57e91c965c. 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/TCAGE2271189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba3cf9ebab44e489b81362bb9b855de13a2a3ea79f30ef65149c44bc0b9005a. 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/TCAGE2271241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f6670d6ea29f5de78d74f5057ac786b4ac15ffdaa7f415f4c6e1deccff1330. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/TCAGE2271263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ccbdbcf3489b9c17017d776a2f5438d15303e935834cd0ffd3636d2c03b488. 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/TCAGE2271270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c50e332545da8a76c319c7cb21db0a7786efc14975516ab817b325ae01919e. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/TCAGE2271286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126a28976b552ebb9aa10056a3c6b0ca6d4d9fab0f118b53a39e631cf48f5449. 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/TCAGE2271292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcc8358edeaf9353ab3aae761c7ab27a1a78926480611910e9d285a10720931. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAGE2271247.
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 0x03dc879431a39270e0ab986658985326f9d3cf1fee93e942b274ba04970dc5f7. 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/TCAFI2175683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95f84669e812636ad7d7eefe0c19cbe093c92e071bbe1f9f643d174ff520107. 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/QZHZ32247122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed24743f5f2f906bca89ce200f46c2d6f520d51d54ce046eaf595fe1dbc8dff. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USL4R2068291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5b72ebaa7d0e6ba6d07f60813cf9e66a5964bbc2a183d45f95bcb942a9e6b2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US7VG2505968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932653bd5bf3c9cb7e91e341f5181da2c585e70815a9a7489fe447c9f80e84ec. 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/US7VG2505976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe90d2bbf8832dca2530ade07b9f761ae8c6a6b37eca2861fabaad960c79847. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US7VG2505972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45aad6e99d61de72dc05d033d73592b5468d28c0339fb6355ebc75e3c543b434. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/QZGLM2565796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe06262225248bdb3c90a7d1d3bce6a83d4c92ae20c744f90a6a0a1cecfa4c7f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZGLM2565798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f68a2b3dce9c0474d3314caef9d477c7c35a77b9fc025b53587e966affe08a. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QZGLM2565799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2367e4231bf92cff0792cf017584234f56a166a7a23a3a706ed63bf71a252eb8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNJZ2468952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0acbb483af44dd90b44370ae4487c7ce4ef69f0a0cec75bc6f22716f08225a76. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZW9L2468870.