Sofia Eugenia Koutsovitis, known professionally as Sofia Rei, is an Argentine vocalist, songwriter, producer, and educator. A classically trained mezzo-soprano, Rei's influences include South American
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 0x96614fb09de82a98490f2297e39d85a4a0cbbda869bdc36ce845638a6a7b1079. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65ca461d-e9bc-4000-8519-081a0b81496f.json and https://artists.proofprofile.net/proofs/artist/65ca461d-e9bc-4000-8519-081a0b81496f.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 0xba77194c06f29479212b983b51033c7f1e5be749953408d32b77c73503a209cc. 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/QZDQH2376101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6578a34bb9a5aa48e773f59fabbe432f4e705c2b894fea863f872bc11b4b64b. 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/TCAHF2335477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006cdcee39d113ec04790a61c21a8f4d14514bb20602e3af553ddf312eddf7be. 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/QZDQH2376103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8415cb2aafda26861b53b4ff35af29c72438c30c9e9f9d905d2e1c1210a59ee0. 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/QZDQH2376105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc61dd3e7f423bea09b3ddbd9ca8fb0b69a2753517ef2e5b7a0ba767b889fc6. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/QZDQH2376102.
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 0xddf5179d12eaf6eb0e90168da3eb574603eab4f108ff646954c34231d7e7318e. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TCAHB2326241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5db00b1134ca1cd6acd4e7ebafbd72054803fb7d7ab05c6dea1a1fbb6f9b39. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZDQH2376104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd501d80765bac4475a35a4ced0b472ed87a1ddc5d2643345b9e2c76cccc135dc. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZDQH2376106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b71eaedbe51104c3011d8724a6b0ea72739641df21bb4d4bef04e2b70e44ac. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QZDQH2376107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe551460bdd5e41614ef0c755af45242ba9612224c380d7eab55c74b1fd610abc. 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/QZP392100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861ff4782de8775aaa1a3c3f9e6b6d968a4264d45b14c5fc3ed42ba241a1ee85. 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/QZP392100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e23bbb8595b72042794db52a5b526dae6edb4f82901585b594a6834f032a16. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZP392100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697ce123e3111091e3a0b660dd73eddd1d8aa082782b808e07ba6f1adf1e35ae. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZP392100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5dbbab9bdcc300a3e9a2b15a724890a1a4412902370f91f2e33b81156f48b3. 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/USA2B1900315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36c47667226da76a342b01c511d733cd09486a6b97e874d55a19701648ef746. 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/USA2B1900317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695c793b1c73459595409e7b3dafa66d92297b4d63025716b3af8459f2a944e2. 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/USA2B1900318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81f2b80b240023df82e70788a478f8c1697a41b974d42eed6d1ff70a54248a2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USA2B1900316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ae2c0633571af1cc74980d795cdff065afa43158a2fd71caac73a4b8161a70. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USA2B1900319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e739ce98b21022f532c3c40897dc50b23ee0ef40769ac85ffc9cda4b5b1ec27. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USA2B1900320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffc85e826e6e1d2b30b4155206003cbc7f6d3447f37d675b9b2f4fb604b8ef5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USA2B1900322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84686d1af772e5f4132d48f84815c08c7716eb102b03e53e2ddf8eac21bce0f6. 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/QMZ5R1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46119d43cf24de5839e156adb904963f00e9514141bdf9cc76d69c31e6a7ea8. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMZ5R1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3f128813b118c8bdd802f89c1cbe6a34388aab27bae335fd8ab3e641e10a1a. 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/QMZ5R1200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4783056f74ff39eacd924c43e7f5cf06ee8d5884f5460a179337e683079440. 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/QMZ5R1200088.
El Niño del Tambor (The Little Drummer Boy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd756f574da34e4ef330e2d0a42c8e893f26c7856bf18c2fb2f8e626fcd780940. 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/GBLFP1894563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27816040c3cefdb0cb435d665ae571f8067a9952c3d5e4a9693fe10adf3148e. 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/GBLFP1894572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2c209996bfc54bff1ba0910380faffc8e08516f7f9a7673a8fe94dd76373e1. 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/GBLFP1894657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084da8c7d5f1124ab4aa4155b58d82b7b6dd111e6e4a12afad793f6f5af2fdf1. 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/GBLFP1894663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86acb1a217a77df9ad602d7e7e20abf70608b3e9e2daf55ef0043f464ae2df7. 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/QZHHQ1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef3d6793ff74c5b14b19ea3ac1d1e48ddffc6eb565cdf6d8688b2ea965bb715. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZHHQ1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4018b053d902cecce7944fc9abd192fc19c5ba091ae664627a67a91fd490678a. 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/ES8511202834.
13 Lunar Meditations: Summoning the Witches