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 0xbd5390a5d59e754ae31c642c670efca5226bc91930232c4bb9466c7ed264323a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bcddb430-48cf-4612-b9c5-e75c2d7b0f1c.json and https://artists.proofprofile.net/proofs/artist/bcddb430-48cf-4612-b9c5-e75c2d7b0f1c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7358aa29e7225132fc29ad27de49f02bab286a56ce9ff750c1e77958e6e52678. 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/ARR9V2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b0e9441a93a218494a2285d0293f77d12a8a8b97438b2f0ad14de8d7c1d2d6. 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/ARR9V2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d3406cb5c50d19c827b36a53d0b9e5f6e52189af5698d722f66979646d2813. 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/ARR9V2200012.
Elegia por la muerte de un tanguero: II. Melancolia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9fd42a7daa84c37beb1ab08249c8a115aa55afeaded1a4a3577fca944c00b4. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLY332200822.
Elegia por la muerte de un tanguero: III. Epilogo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f7c5b97905cad03f316b009c1f060caa7b56e246f77b8350a1c56d6ab04d7b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLY332200823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780a844fad867968b83c17b6b04cb33c46c18808a8ae288793b6aa2596876250. 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/ARZ021600328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbfb1c9a807a655883e0c8d7bbb407a4382ea507a7ea196c53d41974e0820906. 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/ARZ021600329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ef3bc5beaa2a8b1997ee7b742d31037bc79f1958cd14e66e080cfb7fa150ab. 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/ARZ021600330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d00809119ea5fb7c8ff248ffa2d370aa77a537fa946249277ee302d1309963c. 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/ARZ021600331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195fe0258ab98dd9f593f57bdb2520734dc06d02ba15ac7c0ce6cbe6bddcaf82. 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/ARZ021600336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946bc9015c8257a7df8785ba9b9d41f874ea7231bf99d330292b85e396af6e39. 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/ARZ021600337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ee66f095b58da47bc3b6f783d77dc87f34665cc04b90c4ff9f974a7ad3847e. 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/ARZ021600339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4739971626d1548deeeed0ee40c97518ab560cfd9694f74fdae8aee9a8839bd8. 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/ARZ021600341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1caaa7410a02345f441e7869f3680b38b5f525c5099bab73b9a53c1e1117ae2. 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/ARZ021600342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3f578e9ba3f8aa5414d1e86594f9ec18ee25756c27e37d6d024d9764a95cc7. 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/ARZ021600344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e49ce87352d093210c4629350cd6c4bdfbbeb4315649b43b4101de9b1dbeb5c. 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/ARR9V1000001.
Tango, Milonga y Final: II. Milonga de Junio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2cea023110bc5ce3c1d89fc62f2e430330981b92f8ce053122c587ebbb199dd. 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/NLY330905574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb030a30110514600abd1dbd275d71fd4a717e9e9f0c7d6938a7e00521219458e. 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/NLY330905579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e0155809e01b5f6091329ddcc6953bad39b2c77060b798f10601dd164a0e2f. 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/NLY330905582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfe69559e07ea3379440a6d8f53cf626ad6114b8268ee4b89484ba748ba0b1c. 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/NLY330905583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf682aab2aba2b06385b222fab43096bac95860ab2481ec7b02b8f27cb0a36361. 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/ARZ020801986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7df8e3b610fa7b7c42fb43654e98b0b366e3fd94bcc0de0e1753a21257b512. Chain 2 (Bitcoin): anchored in block 957287 (2026-07-09T09:48:29Z), 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/ARZ020801988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b149dd89a2164bf7b2ccbb952bbd464eba91d681a6f5140c0ec6d9d71e2f35. 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/ARZ020801989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd216e3c8e9340ea39e17d3f737886f785fad2aca1235dc25d8c42060d43d67. 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/ARZ020801991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa48cd12d068cf0a4a6ca819036a77b2dbf7aa671af7fc7341b91d6193f8ae15. 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/ARZ020801993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb56db4a151a26a041c10cdedd44321f1246ae8b95cb0752668dd08342ad519d. 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/ARZ020801994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee30e6be1c44b0bfd5cca822c6557d7669251e0926c50de73dadee1f61dbb47. 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/ARZ020801997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2895a3c9ab1725a80e2ae893bb2915ae620d55468c3cb28e729c290f37f7ac29. 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/ARZ020801998.
Tango, Milonga y Final (Oeuvres pour deux guitares)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dedafc04ee4a037c13b2640d1d42b17f28ab828074b79b972be72f3f7267e0. 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/FRX191302230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b57584d103a1fff8a94254ec1a44963a4ece025ce3431076dd59a0c1741dfb5. 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/ARZ020800920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb82a242ff194420c1be15c4f49a012e92b91d9069a3b1ffd7c95a97969968a. 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/ARZ020800921.
Victor Villadangos & Cuarteto de Cuerdas de la Universidad de La Plata
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f41681bf59e45a8ec5c9cb83600f410cdd89cb953d7996a4565ca5d9d796d8. 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/DEKM62400222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b0e9441a93a218494a2285d0293f77d12a8a8b97438b2f0ad14de8d7c1d2d6. 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/ARR9V2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad85f057bfd9d39fbeb273cfd824138dcfaf50410fcfe8179b966380ce355ab. 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/QZNWZ2223572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68081ee5f35c6e40b41eb3c18689161530f3ee1889bd4a8b8744b2c2dd743492. 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/QZPJ32167433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0d487861206b145d90db18ed324c04d017a423fdce1533718abb200729ad65. 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/QZPJ32167434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f74087f4e60aadc7684bcfe620ca86db3b3f0ae7658a646e8986caced2e890. 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/QZPJ32167435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e5d88ddd17eaecd8078e92df33d40a47e51eb92a4a2374778eb336ba6cfd2a. 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/AUAB01150274.